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Q.

In the given circuit if I1 and I2 are the currents in resistors of resistances R1 and R2, respectively, then

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a

I1=3 A,  I2=2 A

b

I1=0,  I2=2 A

c

I1=2A,  I2=2 A

d

I1=2A and I2 can't be determined with given data

answer is D.

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Detailed Solution

Since 3 A is in upper part of circuit. Therefore out of 5 A coming in lower part, 3 A has to go to the upper pert, out of which some part will flow through R2 and rest through the unknown resistance.∴ 2 A will go through R1.
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In the given circuit if I1 and I2 are the currents in resistors of resistances R1 and R2, respectively, then