4.5.5. The d.c. motor
A subsection of Physics, 5054, through 4. Electricity and magnetism
Listing 10 of 48 questions
A d.c. motor consists of a coil of many turns rotating in a fixed magnetic field. The coil is connected to a d.c. supply through a split-ring commutator. N S axle coil of many turns P Q P, Q: halves of split-ring 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?
5054_s09_qp_1
MCQ
2009
Paper 1, Variant 0
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Questions Discovered
48