Physics 5054 · O Level · Magnetic effect of a current
Magnetic effect of a current — practice question
Two flexible iron strips, WX and YZ, are positioned close together inside a solenoid (long coil). The end W of WX and the end Z of YZ are fixed firmly in place. Fig. 6.1 shows the solenoid connected to a d.c. power supply and a switch. When the switch is closed, an electric current flows in the solenoid. End W of flexible iron strip WX becomes a magnetic S-pole.
(a(i))[2]
State the type of magnetic pole formed at X, Y and Z.
(a(ii))[1]
State and explain what happens to X and Y as a result of the flexible iron strips being magnetised.
(b)[2]
A relay uses the current in one circuit to operate a switch in a different circuit. State one example of this and explain why a relay is used.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “At X, the pole is N-pole.” …