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Question

The resistance in the left and right gaps of a balanced meter bridge are R1, R2. The balance point is at 50 cm. If a resistance of 24Ω is connected in parallel to R2the balance point is at 70 cm. The value of R1 is

A
2Ω
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B
8Ω
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C
32Ω
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D
17Ω
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Solution

The correct option is C 32Ω
R1R2=5010050=5050=1;R1=R2R1(24R224+R2)=7010070=703024+R224=7324+R2=56R2=32Ω

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