JEE MAIN - Physics (2022 - 27th July Evening Shift - No. 17)
In the given figure of meter bridge experiment, the balancing length AC corresponding to null deflection of the galvanometer is $$40 \mathrm{~cm}$$. The balancing length, if the radius of the wire $$\mathrm{AB}$$ is doubled, will be ______________ $$\mathrm{cm}$$.
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Answer
40
Explanation
Even if the radius of wire is doubled, the balancing point would not change as $${x \over {l - x}} = {{{R_1}} \over {{R_2}}}$$, which is not including a term of area.
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