A horizontal telegraph wire 0.5 km long running east and west is a part of a circuit whose resistanc

Question

A horizontal telegraph wire 0.5 km long running east and west is a part of a circuit whose resistance is $2.5 \Omega$. The wire falls to the ground from a height of 5 m . If $\mathrm{g}=10.0 \mathrm{~m} / \mathrm{s}^{2}$ and $\mathrm{B}=2 	imes 10^{-5}$ weber $/ \mathrm{m}^{2}$, then the current induced in the circuit is\

Professor PC Thomas Classes · Answer

$I=\frac{e}{R}=\frac{1}{R} \frac{d \phi}{d t}$\ $\mathrm{d} \phi=\mathrm{B} 	imes \mathrm{A}$\ $\mathrm{dt}=\sqrt{2 \mathrm{~h} / \mathrm{g}}=1 \mathrm{sec}$\