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Question

# A series circuit is comprised of a battery with a voltage v, an open switch, solenoid with and inductance L and a resistor with the resistance R.At time t=0, the switch is closed, what is the current through the resistor immediately after the switch is closed?

A
0
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B
VR
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C
VR(1e((R/L)t)
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D
VR(1e((RLt))
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Solution

## The correct option is D 0 Just at the moment , when the switch is closed , current increases in inductor and due to Lenz's law an opposite current is induced in inductor which cancels the current given by battery , therefore total current (current in resistor) is zero just after the switch is closed , after some time applied voltage overcome the induced voltage and current starts flowing in circuit .

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