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Q.

The current in resistance R3 in the given circuit is 2xA. Find the value of x.

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answer is 3.

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Detailed Solution

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Points A and B are at same potential. Between A&D and between B&C, the battery emf (2V) is same. Hence, D and C are also at same potential. No current flows through R1 .
Between D&E and between C&F, the battery emf (3V) is same. Hence, E and F are also at same potential. No current flows through R2 . R1&R2can be disconnected.  
The effective circuit reduces to

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i=423=23A

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