Q.

When two resistances 503Ω and unknown resistance are connected in the left and right gaps of a meter bridge, the balance length is 70cms.
When resistance ‘x’ is connected in parallel to 503Ω the balance length becomes 35cms. The value of ‘x’ is

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a

3Ω

b

10Ω

c

4Ω

d

5Ω

answer is C.

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Detailed Solution

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50/3R=7030(1);(x×50/3)(x+50/3)R=3565(2)
Dividing (1) & (2), x = 5Ω

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