Physics 9702 · AS & A Level · Force on a current-carrying conductor
Force on a current-carrying conductor — practice question
A long, straight, vertical wire A carries a current upwards. It passes through the centre of a horizontal card, as shown in Fig. 10.1. The card is seen from above in Fig. 10.2.
(a)[3]
On Fig. 10.2, draw four lines to show the magnetic field produced by the current-carrying wire.
(b(i))[2]
Explain why a magnetic force acts on each wire.
(b(ii))[1]
State the directions of the forces.
(c)[1]
The currents in the two wires are not equal. Explain whether the magnetic forces on the two wires are equal in magnitude.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “concentric circles centred on the wire” …