The electric motor consists of a current-carrying coil in a magnetic field. The manufacturer wants to increase the turning effect of the coil to make the toy car accelerate faster.

State three ways of increasing the turning effect of the coil.

1. _____________________________________

2. _____________________________________

3. _____________________________________

The toy car can drive both forwards and backwards. State what must happen to the current in the coil to reverse the direction of rotation.

The battery is charged by plugging it into a mains transformer. The primary voltage $V_p$ of the transformer is $240V$ and the secondary voltage $V_s$ is $12V$.

The number of turns on the primary coil $N_p$ is $3200$ turns.

Calculate the number of turns on the secondary coil, $N_s$.