1) The current in a circuit changes from 24A to 0A in 3.0x10 -3 seconds. If the

Question

1) The current in a circuit changes from 24A to 0A in 3.0x10-3seconds. If the average induced emf is 260V, what is the self-inductance of the circuit? How much energy was initially stored in the coil?

2) A 5x10-6F capacitor is charged to a 20x103V potential. After being disconnected from the power source, it is connected across a 7x106ohm resistor to discharge. What is the initial discharge current and how long does it take for the capacitor voltage to decrease to 37% of the 20x103V?

3) A circuit has a resistance of 11ohms, a coil of inductive reactace 120ohms, and a capacitor with 120ohm reactance Calculate the voltage (rms value) across each element.

Explanation / Answer

induced emf = L*(di/dt)

260 = L*(24/(3*10^-3))

L = 0.0325 H

+++++++

(2)

initial currrent I = V/R = (20*10^3)/(7*10^6) = 0.00286 A

volatage decreases as = v = V*e^-t/RC)

v = 0.37 V

0.37 = e^-(t/(7*10^6*5*10^-6))

t = 34.8 s <<-------answer

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