PLEASE SHOW WORK HOW TO SOLVE THIS. Consider the circuit sketched above. The bat

Question

PLEASE SHOW WORK HOW TO SOLVE THIS.

Consider the circuit sketched above. The battery has emf ? = 27 volts and negligible internal resistance. The inductance is L = 0.40 H and the resistances are R1 = 12 ? and R2 = 9.0?. Use Figure 21.29 to answer the following questions:

(a) Initially the switch S is open and no currents flow.Then the switch is closed.What is the current in the resistor R1 just after the switch is closed?

(b) After leaving the switch closed for a long time, it is opened again. Just after it is opened, what is the current in R1?

Answer: (a) 2.3 A (b) 3.0 A

Explanation / Answer

given data

emf = 27 volts

The inductance is L = 0.40 H

R1 = 12 and R2 = 9.0

a)After the switch is closed,

all current goes through resistor R1.

I=27V/12=2.3A.

b)After a long time, the current through R2 is 27V/9=3A.

When switch S is opened, this current will continue to flow through R2 (and R1)

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