(a)[2]
State Faraday’s law for electromagnetic induction.
(b)[3]
An alternating current is sent through a solenoid with an air core. An iron core is then placed inside the solenoid and kept fixed there. The current in the solenoid is now smaller. Explain why the root-mean-square (r.m.s.) value of the current in the solenoid is reduced as a result of inserting the core.
(c)[2]
Practical transformers are very efficient. Even so, some power is lost. State two sources of power loss within a transformer.