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12 Magnetism and the motor effect

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Question 16
H

The Figure shows a simple d.c. electric motor.

The coil ABCD is horizontal at the instant shown. Side AB is next to the north pole and side CD is next to the south pole.

The arrow on side AB shows the direction of the current in that side.

Figure

image

a.

State the direction of the force on side AB.

[1]
b.

Explain why there is no force on side BC at the instant shown.

[1]
c.

Determine whether the coil turns clockwise or anticlockwise when viewed from the front, where the commutator is.

Give a reason for your answer.

[2]
d.

Explain how the split-ring commutator keeps the coil turning in the same direction.

[3]
Markscheme

12 Magnetism and the motor effect Questions

  1. GCSE
  2. /Physics
  3. /12 Magnetism and the motor effect

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