How can a magnetic field produce a turning effect on a current-carrying coil?
Magnetic forces act in opposite directions on opposite sides of the coil, producing a torque.
Cambridge IGCSE (9–1) Physics 0972 (Extended) (2026–2028) · 4.5.5
Revise Cambridge IGCSE (9–1) Physics 0972 (Extended) (2026–2028) specification point 4.5.5, The d.c. motor, with free active-recall flashcards. Flip through the set or review every question and answer below.
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How can a magnetic field produce a turning effect on a current-carrying coil?
Magnetic forces act in opposite directions on opposite sides of the coil, producing a torque.
What is the basis of a d.c. motor?
The turning effect on a current-carrying coil in a magnetic field.
What three changes increase the turning effect on a current-carrying coil, if other relevant conditions remain unchanged?
Increase the number of turns, the current, or the magnetic field strength.
Why does adding turns to a current-carrying coil increase its turning effect?
Each additional turn contributes to the turning effect.