Physics for IGCSE & O level - Magnets And Currents (Section 8 - No. 42)
What happens to the amount of e.m.f. in the second coil if the current in the first coil is switched off?
e.m.f. is induced.
e.m.f. remains the same.
e.m.f. disappears.
e.m.f. increases.
คำอธิบาย
Switching on or off in the first coil causes an e.m.f. to be induced in the second coil.