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Q.

If in an experiment of Wheatstone bridge, the positions of cells and galvanometer are interchanged, then the balance points will

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a

change

b

remain unchanged

c

depend on the internal resistance of the cell and resistance of the galvanometer

d

none of these

answer is B.

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Detailed Solution

When Wheatstone bridge is balanced,PQ=RS. If the galvanometer is replaced with a cell in balanced Wheatstone bridge, the condition for balanced bridge will be P/R = Q/S, which is there. Hence, balance point will remain unchanged, where galvanometer shows no current.
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