Q 110

A copper cable is to be designed to carry a current of 300 A with a power loss of only 2.0 watts per meter.What is the required radius of the copper cable? (The resistivity of copper is 1.7 10^{}^{8} m. )

Q 111

What is the maximum number of 100-W lightbulbs you can connect in parallel in a 120-V home circuit without tripping the 20-A circuit breaker?

Q 112

A 5000- resistor and a 50-F capacitor are connected in series at t = 0 with a 6-V battery.The capacitor is initially uncharged.What is the current in the circuit at t = 0? At t = 0.5 s? What is the maximum charge stored on the capacitor?