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The Wheatstone’s bridge shown in figure is balanced. If the position of the cell E and galvanometer G are now interchanged, G will show zero deflection

(a) Only if all resistor are equal

(b) Only if R1 = R3 and R2 = R4

(c) Only R1 R4 = R2 R3

(d) In all cases

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Correct option(d)

 Explanation:

 For Wheatstone's Bridge to be balanced 

R1/R2 = R3/R4  (or) all resistances are equal (or) R1 = R3 and R2 = R4

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