Physics 5054 · O Level · Forces on a current-carrying conductor
Forces on a current-carrying conductor — practice question
Fig. 6.1 illustrates the arrangement of a basic electric motor. As current passes through the coil, the coil begins to rotate. A student sees that the coil moves in the direction indicated by the curved arrow in Fig. 6.1.
(a(i))[1]
State what happens to the motor if a stronger magnet is used.
(a(ii))[1]
On Fig. 6.1 mark and label:
• the current direction in the coil
• the direction of the magnetic field.
(a(iii))[2]
Explain why the coil rotates.
(b(i))[3]
On Fig. 6.3 sketch the shape of the magnetic field produced. Show the direction of the magnetic field on the pattern you draw.
(b(ii))[2]
The currents in the two wires make the wires push apart. Explain how the current in one wire produces a force on the other wire.
Worked solution & mark scheme
This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Spins faster / stronger force / more powerful motor / larger turning effect” …