The expression for the magnetic energy stored in a solenoid in terms of magnetic field B, area A and length l of the solenoid is:

$$\begin{gathered} 1. \frac{1}{{\mathrm{\mu }}_0}{\mathrm{B}}^2\mathrm{Al} \\ 2. \frac{1}{2{\mathrm{\mu }}_0}{\mathrm{B}}^2\mathrm{Al} \\ 3. \frac{2}{{\mathrm{\mu }}_0}{\mathrm{B}}^2\mathrm{Al} \\ 4. \frac{3}{2{\mathrm{\mu }}_0}{\mathrm{B}}^2\mathrm{Al} \end{gathered}$$

The ratio of magnetic energy per unit volume and electrostatic energy stored per unit volume in a parallel plate capacitor is:

$$\begin{gathered} 1. \frac{1}{{\mathrm{\epsilon }}_0{\mathrm{\mu }}_0}{\left(\frac{\mathrm{B}}{\mathrm{E}}\right)}^2 \\ 2. \frac{1}{{\mathrm{\epsilon }}_0{\mathrm{\mu }}_0}{\left(\frac{\mathrm{E}}{\mathrm{B}}\right)}^2 \\ 3. \frac{1}{2{\mathrm{\epsilon }}_0{\mathrm{\mu }}_0}{\left(\frac{\mathrm{B}}{\mathrm{E}}\right)}^2 \\ 4. \frac{1}{2{\mathrm{\epsilon }}_0{\mathrm{\mu }}_0}{\left(\frac{\mathrm{E}}{\mathrm{B}}\right)}^2 \end{gathered}$$

Kamla peddles a stationary bicycle. The pedals of the bicycle are attached to a 100 turn coil of an area of 0.10 m². The coil rotates at half a revolution per second and it is placed in a uniform magnetic field of 0.01 T perpendicular to the axis of rotation of the coil. What is the maximum voltage generated in the coil?