7: Electric and Magnetic Fields

Question 1

Explain how a transformer produces a higher p.d. on the secondary coil.

Answer 1

• Alternating current in primary coil produces a changing magnetic flux
• The magnetic flux is linked to the secondary coil by the iron core
• The changing magnetic flux induces an e.m.f. in the secondary coil
• More turns on the secondary coil will increase the rate of change of flux linkage