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Consider a 72 cm long wire AB as shown in the figure. The galvanometer jockey is placed at P on AB at a distance x cm from A. The galvanometer shows zero deflection. The value of x, to the nearest integer is ______. [Figure: 12 Ω and 6 Ω in series between the ends A and B of the wire, junction C between them (12 Ω on the A side); galvanometer from C to jockey P on AB; a cell across A and B.]

Asked in JEE Main 18th March 2nd Shift 2021 · Metre bridge

Figure: Metre bridge
Answer: 48

Step-by-step solution

Balance: (12)/6=x/(72-x).

x=2(72-x), so 3x=144.

x=48 cm.

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