KVPY SX SB Exam 2015 Question Paper

Question : 99 of 120

Marks: +1, -0

In the circuit shown below, all the inductors (assumed ideal) and resistors are identical. The current through the resistance on the right is I after the key K has been switched on for along time. The currents through the three resistors (in order, from left to right) immediately after the key is switched off are -

2I upwards, I downwards and I downwards
2I downwards, I downwards and I downwards
I downwards, I downwards and I downwards
0, I downwards and I downwards

Validate

Solution:

Initially circuit is in steady state current through each resistor as all are identical & are in parallel combination. When switch is off current through

L_1 \ &\ L_2

just after remain same.

In right & middle wire current is I downward and in left wire current is 2I upward

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