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Question

The potentiometer wire AB is 100 cm long. The value of R for which the galvanometer shown no deflection, when AC = 40cm shown in figure is
214056.jpg
  1. 13Ω
  2. 17Ω
  3. 15Ω
  4. 21Ω

A
17Ω
B
13Ω
C
15Ω
D
21Ω
Solution
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The condition of no deflection of galvanometer : 10R=ACBC=4010040=23R=15Ω

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