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Q.In the circuit shown, the current through the $4\Omega$ resistor is $1$ A when the points P and M are connected to a 10 V battery. The value of resistance $R$ is

a

12\Omega

b

15\Omega

c

18\Omega

d

20\Omega

Correct Answer: Option B

The correct solution involves applying the fundamental concept to derive the final value step by step...

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