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MHT CET 2019 (3 May, Shift 1) · Wheatstone Bridge & Metre Bridge

Wheatstone Bridge & Metre Bridge question from MHT CET 2019 (3 May, Shift 1)

Q71MHT CET 2019 · 3 MAY · SHIFT 1Difficult

Wheatstone Bridge & Metre Bridge

In the network shown cell E has internal resistance $r$ and the galvanometer shows zero deflection. If the cell is replaced by a new cell of emf $2E$ and internal resistance $3r$ keeping everything else identical, then

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Answer: (b)

Balance condition $\dfrac{R_1}{R_2} = \dfrac{R_3}{R_4}$ depends only on the four arm resistances.
It does not depend on the emf or internal resistance of the cell.
So the bridge stays balanced. The answer is (b) zero deflection.

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