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Question

An unknown resistance is placed in the left gap and resistance of 50ohm is placed in the right gap of a meter bridge. The null point is obtained at 40cm from the left end. Determine the unknown resistance.

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Solution

Let the unknown resistance placed in the left gap be P. Known resistance in the right gap R=50Ω
Null point is obtained at 40 cm i.e. l=40 cm
Using balanced Wheatstone bridge equation PR=l100l
P50=4010040
We get P=33.33Ω

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