Y11 Homework on electric motors

H2 Electromagnetism
1 (a) (i) From N pole to S pole. 1
(ii) No effect. 1
(iii) The wire moves 1
vertically/at right angles to the field. 1
(iv) The wire moves in the opposite direction. 1
(v) Wire moves faster/more force on wire. 1
(vi) No effect. 1
(b) (i) Using your left hand point first finger in the
direction of the magnetic field 1
point second finger in the direction of
the current. 1
The thumb points in the direction of
motion (force). 1
(ii) The wire moves upwards. 1
(iii) The force on the wire is upwards. 1
Total 12
2 (a) N pole to S pole/left to right. 1
(b) Field and wire are at right angles/90°. 1
(c) (i) Upwards. 1
(ii) Downwards. 1
(d) The coil rotates. 1
(e) The commutator and brushes allow current to
flow through the coil during rotation, 1
the commutator reverses the current every
half cycle, 1
so rotation continues in the same direction. 1
Total 8