Quiz 8: Electricity and Magnetism

Electric charge is measured in units of A) coulombs. B) watts. C) volts. D) newtons.

The mathematical form of Coulomb's law is similar to that of A) the second law of thermodynamics. B) the second law of motion. C) Kepler's second law. D) the law of gravitation.

A system of an electron, a proton, and a neutron has a net charge of A) +1.6 × 10^-19 C. B) -1.6 × 10^-19 C. C) 3.2 × 10^-19 C. D) zero.

A system of 8 electrons, 18 protons, and 4 neutrons has a net charge of A) 16.0 × 10^-19 C. B) -16.0 × 10^-19 C. C) 22.4 × 10^-19 C. D) 10.0 × 10^-19 C. E) -22.4 × 10^-19 C.

A system of 12 electrons and 18 protons has a net charge of A) 9.6 × 10^-19 C. B) -9.6 × 10^-19 C. C) 17.6 × 10^-19 C. D) 6.0 × 10^-19 C. E) -17.6 × 10^-19 C.

A system of 11 protons and 15 neutrons has a net charge of A) 17.6 × 10^-19 C. B) -17.6 × 10^-19 C. C) 41.6 × 10^-19 C. D) 11.0 × 10^-19 C. E) -41.6 × 10^-19 C.

A system of 18 electrons and 11 neutrons has a net charge of A) -28.8 × 10^-19 C. B) 28.8 × 10^-19 C. C) -11.2 × 10^-19 C. D) -18.0 × 10^-19 C. E) 11.2 × 10^-19 C.

A system of an electron and a neutron has a net charge of A) +1.6 × 10^-19 C. B) -1.6 × 10^-19 C. C) 3.2 × 10^-19 C. D) zero.

A system of a proton and a neutron has a net charge of A) +1.6 × 10^-19 C. B) -1.6 × 10^-19 C. C) 3.2 × 10^-19 C. D) zero.

A system of a proton and an electron has a net charge of A) +1.6 × 10^-19 C. B) -1.6 × 10^-19 C. C) 3.2 × 10^-19 C. D) zero.

An object that is negatively charged will A) attract a rubber rod stroked with fur. B) attract a glass rod stroked with silk. C) be polarized. D) none of these

An object that is positively charged will A) attract a rubber rod stroked with fur. B) attract a glass rod stroked with silk. C) be polarized. D) none of these

An object that is negatively charged will A) repel a rubber rod stroked with fur. B) repel a glass rod stroked with silk. C) be polarized. D) none of these

An object that is positively charged will A) repel a rubber rod stroked with fur. B) repel a glass rod stroked with silk. C) be polarized. D) none of these

The unit for current is the A) ampere. B) ohm. C) coulomb. D) volt.

Ohm's law gives the relationship between A) current and voltage. B) work and current. C) current and charge. D) force and current.

In a conductor, what moves? A) Electrons B) Neutrons C) Quarks D) Protons

One ampere × one second is a unit of A) power. B) current. C) voltage. D) electric charge. E) resistance.

The unit of resistance is called a(n) A) volt. B) ampere. C) coulomb. D) ohm. E) watt.

The abbreviation of the unit of resistance is A) B) C) D) E)

Which of the following would be the least conductive? A) Copper B) Salt water C) Glass D) Mercury

For an ohmic conductor, current is A) inversely proportional to voltage. B) inversely proportional to resistance. C) independent of resistance. D) independent of voltage.

For an ohmic conductor, current is A) directly proportional to voltage. B) directly proportional to resistance. C) independent of resistance. D) independent of voltage.

The electrical power dissipated by a resistance R is A) inversely proportional to I. B) directly proportional to I². C) directly proportional to I. D) none of these.

The electrical power dissipated in an appliance depends on A) voltage. B) current. C) resistance. D) all of these.

If work is done on an electric charge, a ______________ is present. A) resistance B) current C) voltage D) transformer E) bigger charge

A component in an automobile 12-V electrical system has a resistance of 90 Ω. How much current is in the component when in operation? A) 100 A B) 0.13 A C) 7.5 A D) 1100 A

A component in an automobile 12-V electrical system has a resistance of 20 Ω. How much energy is dissipated by the component each second? A) 0.14 J B) 7.2 J C) 1.7 J D) 0.6 J

Voltage is defined as the ______________ per unit ______________. A) charge; current B) work; current C) charge; work D) work; charge

The electric company charges a home on the basis of consumption of A) resistance. B) energy. C) current. D) voltage. E) power.

If the voltage across a resistor is doubled, the current will A) remain the same. B) be cut to one-fourth. C) be cut in half. D) be doubled. E) be quadrupled.

If the voltage across a resistor is tripled, the current will A) remain the same. B) be cut to one-third. C) be cut by one-third. D) be tripled. E) be multiplied by nine.

Three resistors, 90 Ω, 40 Ω, and 60 Ω, are wired in series and connected to a 120-V battery. What is the equivalent resistance for this circuit? A) 190 Ω B) 19 Ω C) 0.053 Ω D) 216000 Ω

Three resistors, 30 Ω, 20 Ω, and 60 Ω, are wired in series and connected to a 120-V battery. What is the equivalent resistance for this circuit? A) 110 Ω B) 10 Ω C) 0.1 Ω D) 36000 Ω

Three resistors, 80 Ω, 10 Ω, and 70 Ω, are wired in parallel and connected to a 120-V battery. How much current flows in this circuit? A) 0.75 Α B) 15 Α C) 950 Α D) 0.0021 Α

Three resistors, 20 Ω, 10 Ω, and 80 Ω, are wired in series and connected to a 120-V battery. How much current flows in this circuit? A) 1.1 Α B) 20 Α C) 740 Α D) 0.0075 Α

In a battery circuit with different resistors in parallel, A) the total resistance is larger than the value of the largest resistor. B) the current is the same through each resistor. C) the total resistance is larger than the value of the smallest resistor. D) the voltage is the same across each resistor.

For electrical safety, A) electrical shocks caused by 1 A of current are of no concern. B) fuses or circuit breakers are wired in series in circuits. C) fuses larger than the rated value can be placed in a circuit. D) fuses and circuit breakers are wired in parallel in circuits.

The source of magnetism is A) polarization. B) magnetic monopoles. C) electrons. D) protons.

Magnetism results from A) the movement of magnetic particles. B) the movement of electric charge. C) Earth's magnetic field. D) the movement of magnetic charge.

The direction of the magnetic field of a bar magnet is A) in the direction a compass would point. B) in any direction. C) away from the south pole. D) toward the north pole.

The direction of the magnetic field of a bar magnet is A) in the direction opposite to that in which a compass would point. B) in any direction. C) toward the south pole. D) toward the north pole.

The direction of the magnetic field of a bar magnet is A) in the direction opposite to that in which a compass would point. B) in any direction. C) away from the south pole. D) away from the north pole.

Earth's magnetic field A) results from a huge bar magnet within the planet. B) is believed to arise from currents within the planet's core. C) is always parallel to the planet's surface. D) is always in the same direction.

A ferromagnetic material is magnetized by the alignment of A) domains. B) atoms. C) single magnetic dipoles. D) poles.

The angle between true north and the direction in which a compass needle points is called the angle of A) attack. B) inclination. C) declination. D) dip.

A ferromagnetic material loses this property above the ______________ temperature. A) domain B) Faraday C) Curie D) Coulomb

A motor converts A) electricity into magnetism. B) electrical energy into mechanical energy. C) mechanical energy into electrical energy. D) force into power.

Consider a wire at rest in a magnetic field as shown in the following figure. What will happen to the wire? A) A current will flow in the wire. B) The wire will be pushed perpendicular to the plane of the magnetic field. C) The wire will be pushed toward the north pole. D) Nothing will happen.

Consider a wire in a magnetic field, as shown in the following figure, with a current flowing through it. What will happen to the wire? A) The wire will be forced toward the north pole. B) The wire will be forced perpendicular to the plane of the magnetic field. C) The current will cease flowing. D) Nothing will happen.

Consider a wire in a magnetic field, as shown in the following figure, with a current flowing upward through it. What will happen to the wire? A) The wire will be forced toward the north pole. B) The wire will be forced perpendicular to the plane of the magnetic field, into the page. C) The wire will be forced perpendicular to the plane of the magnetic field, out of the page. D) The current will cease flowing. E) The wire will be forced toward the south pole.

Consider a wire in a magnetic field, as shown in the following figure, with a current flowing downward through it. What will happen to the wire? A) The wire will be forced toward the north pole. B) The wire will be forced perpendicular to the plane of the magnetic field, into the page. C) The wire will be forced perpendicular to the plane of the magnetic field, out of the page. D) The current will cease flowing. E) The wire will be forced toward the south pole.

A transformer with 600 turns on the primary coil is used to decrease the voltage from 3000 V to 120 V for home use. How many turns should be in the secondary coil? A) 600 turns B) 15000 turns C) 24 turns D) 3720 turns

An ac voltage can be increased or decreased easily using a A) battery. B) transformer. C) fuse. D) motor. E) generator.

A generator is a device that converts A) heat energy into mechanical energy. B) chemical energy into electrical energy. C) mechanical energy into electrical energy. D) electrical energy into mechanical energy.

A(n) ______________ is an elementary particle with a charge of +1.6 × 10^-19 C. A) electron B) neutron C) proton D) atom

A(n) ______________ is an elementary particle with no charge. A) electron B) neutron C) proton D) atom

A(n) ______________ is an elementary particle with a charge of -1.6 × 10^-19 C. A) electron B) neutron C) proton D) atom

An insulator has a positive electric charge of 8 × 10 -17 C. How many electrons were added or removed? A) 500 electrons removed B) 20 electrons removed C) 500 electrons added D) 20 electrons added

An insulator has a negative electric charge of 2.4 × 10 -17 C. How many electrons were added or removed? A) 150 electrons removed B) 67 electrons removed C) 150 electrons added D) 67 electrons added

If a negatively charged object is brought near a suspended, positively charged object, the suspended object will be A) repelled. B) charged more. C) discharged. D) attracted.

If a positively charged object is brought near a suspended, positively charged object, the suspended object will be A) repelled. B) charged more. C) discharged. D) attracted.

If a negatively charged object is brought near a suspended, negatively charged object, the suspended object will be A) repelled. B) charged more. C) discharged. D) attracted.

If a positively charged object is brought near a suspended, negatively charged object, the suspended object will be A) repelled. B) charged more. C) discharged. D) attracted.

A(n) ______________ is an elementary particle with a charge of +1.6 × 10^-19 coulomb.

If a negatively charged object is brought near a suspended, positively charged object, the suspended object will be ______________.

Two oppositely charged particles ______________ one another.

The rate of flow of electric charge is measured in units called ______________.

The unit of electric current is the ______________.

According to the law of charges, unlike charges ______________.

An object may be electrically neutral, but regions may be charged by ______________.

In a(n) ______________, electrons do not move freely.

Another name for electric potential difference is ______________.

Voltage has the units of ______________, which is called a volt.

The expression that mathematically describes the force between two static electric charges is called ______________.

The resistances are added in a(n) ______________ circuit.

The expression V = IR is called ______________.

Power may be expressed as _____________ times resistance.

The maximum current would flow in a set of resistors connected in ______________.

To prevent a home electric circuit from overheating because of too much current, a(n) ______________ is used.

The voltage for typical home appliances is ______________.

A circuit breaker is connected in ______________ in a circuit.

Zero potential in household electricity is called ______________.

According to the law of poles, like poles ______________.

The law of poles states that like magnetic poles ______________ and unlike magnetic poles ______________.

Magnetic fields can deflect ______________ charges.

The north pole of a compass points toward Earth's magnetic ______________ pole.

A ferromagnetic material loses this property above the ______________ temperature.

A moving electric charge or a current in a magnetic field may experience a(n) ______________.

A(n) ______________ converts mechanical energy into electrical energy.

A(n) ______________ converts electrical energy into mechanical energy.

In a dc motor, the polarity and current are reversed by a(n) ______________.

A step-down transformer has more windings on the ______________ coil.

AC voltage may be stepped up or stepped down using a(n) ______________.

Three resistors, 10 Ω, 20 Ω, and 30 Ω, are wired in series and connected to a 120-V battery. How much current flows in the circuit?

An insulator has a positive electric charge of 2.4 × 10 -¹⁷ C. How many electrons were added or removed?

If two protons are moved 3 times farther apart, the electrical force between them is what factor of the original force?

If two protons are moved 3 times closer together, the electrical force between them is what factor of the original force?

A steady current of 0.15 A exists in a wire for 20 s. a. How much net charge passes by a point in the wire? b. How many electrons does this charge represent?

A component in an automobile 12-V electrical system has a resistance of 20 Ω. a. How much current is in the component when the system is in operation? b. How much energy is dissipated by the component each second?

A current of 6.0 A flows through a resistance of 50 Ω. How much power is dissipated?

In a 12-V battery circuit, a 10-Ω resistor and a 30-Ω resistor are connected in series. How much current does the battery supply to the circuit?

A 20-Ω resistor and a 30-Ω resistor are wired in parallel and connected to a 9.0-V battery. a. How much current is drawn from the battery? b. How much power is dissipated in the circuit?

Three resistors, 10 Ω, 20 Ω, and 30 Ω, are wired in series and connected to a 120-V battery. How much current flows in the circuit?

Three resistors, 10 Ω, 20 Ω, and 30 Ω, are wired in parallel and connected to a 12-V battery. How much current flows in the circuit?

A 10-Ω resistor and a 20-Ω resistor are connected in parallel, and this combination is connected in series to a 30-Ω resistor. If the arrangement is hooked to a 12-V battery, how much current flows in the circuit?

A transformer with 800 turns on the primary coil is used to decrease the voltage from 2000 V to 120 V for home use. How many turns should be in the secondary coil?

A doorbell has an input voltage of 120 V. A transformer that steps the voltage down to 12 V has 500 turns on its primary. What is the number of turns on the secondary?

The voltage in a house is measured to be 122.5 V. What is the current drawn by a 75.0-W light bulb?