A rectangular loop is provided with sliding connector of length $1 \mathrm{~m}$ and resistance $2 \Omega$.…
A rectangular loop is provided with sliding connector of length $1 \mathrm{~m}$ and resistance $2 \Omega$. It is placed in a uniform magnetic field of $2 \mathrm{~T}$ perpendicular to the plane of the loop. The external force required to keep the connector moving with uniform velocity $2 \mathrm{~ms}^{-1}$ is