In the circuit shown in the figure (Figure 1) , assume that switch S 1 has been

Question

In the circuit shown in the figure (Figure 1) , assume that switch S1 has been closed and S2 open for a very long time. Then switch S2 is closed, while switch S1 remains closed. The emf of the battery is E = 40.0 V , the two resistors are R0 = 50.0 ? and R = 150 ? , and the intuctor is L = 4.50 H .

Part A

At the instant after S2 is closed, what current flows through R?

Part B

At the instant after S2 is closed, what current flows through S2?

Part C

A very long time after S2 is closed, what current flows through R?

Part D

A very long time after S2 is closed, what current flows through S2?

Explanation / Answer

In Rl circuit

i = V/R (1 - e^(-Rt/L) )

here V = 40 V

R = 200 ohm

L = 4.5 H

part A

the current is i = v/R

i = 40/200

i = 0.2 A

part B

no current or neglible current flows through S2

part C

the same current i = 0.2 A flows through R

part D

no current or neglible current flows through S2

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