The magnet is moved towards the coil with speed ' $\mathrm{V}$ '. The induced e.m.f. in the coil is '…
The magnet is moved towards the coil with speed ' $\mathrm{V}$ '. The induced e.m.f. in the coil is ' $\mathrm{e}$ '. The magnet and the coil move away from one another each moving with speed ' $\mathrm{V}$ '. The induced e.m.f. in the coil is
$e$
$2e$
$\frac{\mathrm{e}}{2}$
$4e$
Solution
The equation for the induced emf is: $\mathrm{e}=\mathrm{B} l \mathrm{~V}$
Relative velocity between the coil and the magnet is:
$\mathrm{v}_{\mathrm{r}}=2 \mathrm{v}$
$\therefore \quad$ The new induced emf in the coil is:
$\mathrm{e}_{\text {new }}=\mathrm{B} l \cdot 2 \mathrm{~V}=2 \mathrm{e}$
