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Question

AB is a potentiometer wire of length 100 cm and resistance 10 ohms. It is connected in series with a resistance R=40 ohms and a battery of e.m.f. 2 V and negligible internal resistance. If a source of unknown e.m.f. E is balanced by 40 cm length of the potentiometer wire, the value of E is :-
1506286_1d9c13339bf24513a1a6df0dc52026f2.png

A
0.8 V
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B
1.6 V
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C
0.08 V
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D
0.16 V
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Solution

The correct option is D 0.16 V
Weknow,E=e(R+Rh+r)RL×lNow,=2(10+40+0)×101×0.4=0.16V
Hence, Option D is correct.

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