GCSE Physics Question Analysis Topic: Physics - Short Questions
1) How does the mutual inductance of a pair coils change when
(i) distance between the coils is increased and
(ii) number of turns in the coils is increased?
2) The motion of copper plate is damped when it is allowed to oscillate between the two poles of a magnet. What is the cause of this damping?
1) (i) The magnetic flux marked by the stationary coil decreases as the distance between the coils increases, and as a result, the mutual inductance of the two coils also reduces. (by ϕ = MI)
(ii) By μn1n2AIM = μn1n2AI, the mutual inductance of two coils can be found. That being said, mutual inductance increases when the number of turns increases.
2) There is a continuous flux change in the magnetic field linked with the pendulum as the copper plates oscillate in the magnetic field between the magnet's two poles. As a result, eddy currents are created in the copper plate, which aim to counteract the pendulum's motion in accordance with Lenz's principles, eventually putting it to rest.
End of analysis. Great!