(a(i))[1]
State the meaning of a magnetic field.
(a(ii))[1]
On Fig. 8.1, draw an arrow on the axis of the solenoid to indicate the direction of the magnetic field inside the solenoid. Label this arrow P.
(b(i))[2]
State Lenz’s law.
(b(ii))[3]
Use Lenz’s law to state and explain the direction of the magnetic field produced by the induced current in the small coil. On Fig. 8.1, show this direction with an arrow inside the small coil.
(c)[3]
The small coil has a cross-sectional area of $7.0 \times 10^{-4}\,\text{m}^2$ and has $75$ turns of wire. A steady current in the solenoid creates a uniform magnetic flux density of $1.4\,\text{mT}$ across the small coil. The current in the solenoid is then reversed in $0.12\,\text{s}$. Calculate the average e.m.f. induced in the small coil.