Q.

A battery of e.m.f. 10 V is connected to resistance as shown in figure. The potential difference VA −VB the points A and B is

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a

−2V

b

2 V

c

5 V

d

2011  V

answer is B.

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Detailed Solution

Req = 5  Ω,  Current  i=105=2A and current in each branch = 1 APotential difference between C and A,VC −VA=1 ×1=1 V                 …..(i)Potential difference between C and B,VC −VB=1 ×3=3 V                …..(ii)On solving (i) and (ii), VA −VB=2V
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