Question 432: Current Electricity

Question

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 ______________ $$\mathrm{cm}$$.

Accepted Answer

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.

Current Electricity

In the given figure of meter bridge experiment, the balancing length AC corresponding to null deflection of the galvanometer is $40 \mathrm{~cm}. The balancing length, if the radius of the wire \mathrm{AB} is doubled, will be ______________ \mathrm{cm}$.

Choose the correct answer: