Question 128: 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}.

Integer / Numeric Answer Type