Physics 9702 · AS & A Level · Electromagnetic induction
Electromagnetic induction — practice question
A small solenoid with a cross-sectional area of $1.6 \times 10^{-3}\,\text{m}^2$ is located inside a larger solenoid with a cross-sectional area of $6.4 \times 10^{-3}\,\text{m}^2$, as shown in Fig. 6.1. The larger solenoid has $600$ turns and is connected to a d.c. power supply so that it produces a magnetic field. The smaller solenoid has $3000$ turns.
(a)[1]
Compare the magnetic flux present in the two solenoids.
(b)[1]
Compare the magnetic flux linkage present in the two solenoids.
(c(i))[2]
State Lenz’s law in electromagnetic induction.
(c(ii))[3]
The terminals of the smaller solenoid are joined together. The smaller solenoid is then taken out from inside the larger solenoid. With reference to magnetic fields, explain why a force is required to remove the smaller solenoid.
(ii)[3]
The terminals of the smaller solenoid are joined together. The smaller solenoid is then taken out from inside the larger solenoid.\n\nWith reference to magnetic fields, explain why a force is required to remove the smaller solenoid.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The magnetic field is weaker in the smaller solenoid” …