*
Note that sensitive electrical instruments in the vicinity of an electromagnet
can be damaged due to the induced emfs (and the resulting currents)  when the
electromagnet is turned on or off Rationalised 2023-24
Physics
158
 EXAMPLE 6 1
The magnitude of the induced emf in a circuit is equal
to the time rate of change of magnetic flux through the
circuit Mathematically, the induced emf is given by
d
– d
ΦtB
ε =
(6