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1. How long is a tungsten wire if it has a diameter of 0.181×10−3 m and...

1. How long is a tungsten wire if it has a diameter of 0.181×10−3 m and a resistance of 3.71 kΩ? The resistivity of tungsten is 5.62×10−8 Ω·m.

2. An initially uncharged 3.09 μF capacitor and a 7.89 kΩ resistor are connected in series to a 1.50 V battery that has negligible internal resistance. What is the initial current in the circuit, expressed in milliamperes? How much time, in milliseconds, must elapse from the closing of the circuit for the current to decrease to 3.57% of its initial value?

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