In the circuit shown below, the cell has an e.m.f. of 10 V and internal resistance of 1 Ω. The other resistances are shown in the figure. The potential difference VA−VB is

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6 V

4 V

2 V

−2 V

answer is D.

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Detailed Solution

Equivalent external resistance of the given circuit, Req = 4 ΩCurrent given by the cell, i=EReq+r = 104+1=2 AHence, VA−VB =i2 × R2−R1=22 2−4 =−2V

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