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Q.

In a metre bridge, metal wire is connected in the left gap, standard resistance is connected in the right gap and balance point is found. If the metal wire in the left gap is heated, the balance point

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a

shifts towards left

b

shifts towards right

c

does not shift

d

depends on thickness of metal wire

answer is B.

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Detailed Solution

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When the metal wire is heated, it's resistance increases. Consequently the left side of the balance point should increase in length to maintain balance. Therefore the balance point shifts right.

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