Some changes are made, one at a time.
• The d.c. supply is reversed.
• The coil is turned before switching on, so that P starts on the right and Q on the left.
• The poles of the magnet are reversed.
• The turns on the coil are increased in number.
How many of these changes make the coil rotate in the opposite direction?
A 1
B 2
C 3
D 4