CIE iGCSE Co-Ordinated Science P4.5.1 Electromagnetic induction Exam Style Questions Paper 2
▶️ Answer/Explanation
The resistance of the conductor affects current flow once the circuit is complete, but it does not determine the size of the e.m.f. generated.
✅ Answer: (B)
▶️ Answer/Explanation
Using the right-hand grip rule with the current going into the page, the field circles clockwise (as seen from the reader’s viewpoint), matching diagram A.
✅ Answer: (A)
Question
A magnet is moved in and out of a coil and an electromotive force (e.m.f.) is induced. How can the size of the induced e.m.f. be decreased?
(A) Add more turns to the coil.
(B) Move the magnet more quickly.
(C) Move the magnet more slowly.
(D) Turn the magnet around before moving it in and out.
▶Answer/Explanation
Ans :C
Question
When a straight conductor moves through a magnetic field, an electromotive force (e.m.f.) is
induced between the ends of the conductor.
Which factor does not affect the magnitude of the induced e.m.f.?
A the length of conductor in the field
B the resistance of the conductor
C the speed at which the conductor moves
D the strength of the magnetic field
▶️Answer/Explanation
Ans : B
Question
Which type of magnet can be switched on and off many times per second?
(A) an electromagnet only
(B) a permanent magnet only
(C) both electromagnets and permanent magnets
(D) neither electromagnets or permanent magnets
▶️Answer/Explanation
Ans: A