Physics for IGCSE & O level - Magnets And Currents (Section 1 - No. 30)
Which of the following factors can increase the e.m.f. induced in a wire?
Moving the wire faster.
Using a stronger magnet.
Increasing the number of turns on the coil.
Decreasing the length of wire in the magnetic field.
Vysvětlení
The e.m.f. induced in a wire increases with the speed of movement, stronger magnets, and more turns in the coil. Decreasing the length of wire decreases the e.m.f.