EXERCISE 9

Magnetic flux through a coil changes from $12 \mathrm{mWb}$ to $6 \mathrm{mWb}$ in $0.015 \mathrm{s}$. What is the induced emf in volts?

A metallic wire $1 \mathrm{m}$ in length is moving normally across a magnetic field of $0.1 \mathrm{T}$ with a speed of $5{ \mathrm{m} \mathrm{s}}^{-1}$. What is emf (in volts) between ends of the wire?

Determine electrical power dissipated could be. A short-circuited coil is placed in a time varying magnetic field. Electrical power is dissipated due to the current induced in the coil. If the number of turns were to be quadrupled (four times) and the wire radius halved.

A field line is shown in Fig. $9.78$. The field cannot represent

Two metallic rings $A$ and $B$, identical in shape and sign but having different resistivities ${\rho }_A$ and ${\rho }_B$, are kept on top of two identical solenoids as shown in Fig. $9.79$. When current $I$ is switched on both the solenoids in identical manner, the rings $A$ and $B$ jumps to height $h_A>h_B$. The possible relation (s) between their resistances and their mass is (are)

Find correct statement for, A current carrying infinitely long wire is kept along the diameter of a circular wire loop, without touching it.

A metal rod is moved with a uniform velocity in a magnetic field. A potential difference is developed across the two ends of the rod if

A circular loop of wire is placed in a uniform magnetic field perpendicular to the plane of loop. An emf is induced in the loop if