PH-1639
D.c. motor
Physics · Secondary 4 · Medium · D.c. motor
A small d.c. motor uses a split-ring commutator so that the coil keeps rotating in the same direction. At the instant when the plane of the coil is vertical (halfway between the poles), what can be said about the forces on the sides of the coil and the turning moment on the coil?
- Forces are zero, moment is zero
- Forces are zero, moment is non-zero
- Forces are non-zero, moment is zero
- Forces are non-zero, moment is non-zero
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