## Fundamentals of Physics Study Set 2

Physics & Astronomy

## Quiz 27 :

Circuits

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Q25 Q25 Q25

The positive terminals of two batteries with emf's of

_{1 }and_{2}, respectively, are connected together.Here_{1 }>_{2.}The circuit is completed by connecting the negative terminals.If each battery has an internal resistance of r, the rate in watts at which electrical energy is converted to chemical energy in the smaller battery is:Free

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Q50 Q50 Q50

Two identical batteries, each with an emf of 18 V and an internal resistance of 1 , are wired in parallel by connecting their positive terminals together and connecting their negative terminals together.The combination is then wired across a 4- resistor.The current in the 4- resistor is:

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Q51 Q51 Q51

Two identical batteries, each with an emf of 18 V and an internal resistance of 1 , are wired in parallel by connecting their positive terminals together and connecting their negative terminals together.The combination is then wired across a 4- resistor.The current in each battery is:

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Q52 Q52 Q52

Two identical batteries, each with an emf of 18 V and an internal resistance of 1 , are wired in parallel by connecting their positive terminals together and connecting their negative terminals together.The combination is then wired across a 4- resistor.The potential difference across the 4- resistor is:

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Multiple Choice

Q68 Q68 Q68

Four circuits have the form shown in the diagram.The capacitor is initially uncharged and the switch S is open. The values of the emf , resistance and R, and capacitance C for each for the circuits are Rank the circuits according to the current just after switch S is closed least to greatest.

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Q70 Q70 Q70

Four circuits have the form shown in the diagram.The capacitor is initially uncharged and the switch S is open. The values of the emf , resistance R, and the capacitance C for each of the circuits are Rank the circuits according to the time after switch S is closed for the capacitors to reach half their final charges, least to greatest.

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Q71 Q71 Q71

In the circuit shown, both resistors have the same value R.Suppose switch S is initially closed and capacitor C is charged.When switch S is then opened, the circuit has a time constant

_{a}.Conversely, suppose S is initially open and capacitor C is uncharged.When switch S is then closed, the circuit has a time constant _{b}.The ratio _{a}/_{b}is:Free

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