Questions

in the meter bridge shown in figure, initially P/Q = 1. Find the shift in the null point if P is doubled and Q is halved.

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40 cm

20 cm

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30 cm

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detailed solution

Correct option is D

If l be the initial distance of the null point from end A, then Pl=Q100-l⇒l=100QP+1Initially, l=1001+1cm=50 cmFinally l'=10014+1cm=80 cm∴ shift=l'-l=80 cm - 50 cm = 30 cm

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