Question

an unknown resistance X is placed in left gap of meter bridge and 50ohm resistance in right gap. the null point is at 40cm from left end . find out shift in the null point if the unknown resistance is shunted by 2x
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Answer 1

Answer:

Explanation:

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(AFTER THIS YOU WILL DO )