Question

Q30. When working near some large air cored inductors you misplace a socket and as you cannot find it you

proceed to energise the system. However, you find that something does not operate as expected. Upon
investigation you find that the socket had fallen into a coil. Select the best explanation for what happened.
The socket became permanently magnetised
The socket changed the inductance of the coil
The socket introduced an air gap into the original core
The socket caused a change in the magnetic circuit shorting out the coil​

Answer 1

When the piece of metal blundered into the air-core coil, it changed the inductance of the coil.