No currents flow in the circuit before the switch is closed. Consider all circui

Question

No currents flow in the circuit before the switch is closed. Consider all circuit elements to be ideal. (Let V = 49 V, L = 17 mH, R1 = 26 k?, and R2 = 2.9 k?.)

(a) At the instant the switch is closed, what are the values of the currents I1 and I2, the potential differences across the resistors, the power supplied by the battery, and the induced emf in the inductor?

(b) After the switch has been closed for a long time, what are the values of the currents I1 and I2, the potential differences across the resistors, the power supplied by the battery, and the induced emf in the inductor?

current I1 A current I2 A voltage across R1 V voltage across R2 V power supplied by the battery W induced emf in the inductor V

Explanation / Answer

after the switch has been closed for a long time:inductor acts as open circuit

the values of the currents I1 =49/26=1.8 milli amper

and I2=0 because inductor acts as open circuit,

the potential differences across the resistors

R1= 49 volts R2= infinity(open ckt)

, the power supplied by the battery,= 49*1.88=92.346 milli volt amp

and the induced emf in the inductor=49 volts

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