Figure 9.1 shows a copper cylinder placed on two metal rods in the magnetic field between the poles of a magnet. The switch is closed. On Figure 9.1, mark with an arrow the direction of the current in the copper cylinder.

Draw with the mouse or a finger.

9(a)(ii)Motor Effect Electric MotorsEasy1 mark

The copper cylinder moves to the left along the horizontal metal rods. Complete the sentences about pole X and pole Y. Pole X is a ___ pole. Pole Y is a ___ pole.

Answer

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9(a)(iii)Motor Effect Electric MotorsEasy2 marks

Suggest two changes that each increase the force on the copper cylinder.

Two answers required.

9(b)(i)Motor Effect Electric MotorsMedium2 marks

Figure 9.2 shows a d.c. motor.

Figure 9.2, a d.c. motor: a rectangular coil free to turn about an axis between magnetic poles N and S, connected through a split-ring commutator and two brushes to a d.c. supply

Explain how the split-ring commutator allows the coil to rotate continuously.

Answer

0 words

9(b)(ii)Motor Effect Electric MotorsEasy1 mark

Explain the purpose of the brushes.

Answer

0 words