The current through the solenoid is changing in such way that flux through it is given by $\varphi =\epsilon \text{t}$. The solenoid is surrounded by a loop having resistance ${\text{R}}_{\text{1}}$ and ${\text{R}}_{\text{2}}$ as shown. Then the reading of the two voltmeters ${\mathrm{V}}_1$ and ${\mathrm{V}}_2$ differ by :

The magnetic flux linked with a coil (in $\mathrm{Wb}$) is given by the equation  $\varphi =5t^2+3t+16$. The magnitude of induced emf in the coil at the fourth second will be:

A light disc made of aluminium (a nonmagnetic material) is kept horizontally and is free to rotate about its axis as shown in the figure. A strong magnet is held vertically at a point above the disc away from its axis. On revolving the magnet about the axis of the disc, the disc will (figure is schematic and not drawn to scale)

A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will be seen on the galvanometer $\text{G}$ attached across the coil?