Q88 / 90 · JEE Main 2021 (18 Mar Shift 2) · Physics

Consider a $72 cm$ long wire $A B$ as shown in the figure. The galvanometer jockey is placed at $P$ on $A B$ at a distance $x cm$ from $A$ . The galvanometer shows zero deflection.
The value of $x$ , to the nearest integer, is

Correct answer: 48

Solution

In balanced conditions,

$\frac{12}{6} = \frac{x}{72 - x}$

$\Rightarrow x = 48 cm$ .

Hence, the correct answer is 48.

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