A close circuit consists of a resistor R. inductor of
inductance L and a source of emf E are connected
in series. If the inductance of the coil is abruptly
decreased to L/4 ( by removing is magnetic core).
the new current immediately after this moment is:
(before decreasing the inductance the circuit is in
steady state)
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Answer:
As the inductor decreases to
4
L
, inductive reactance X
L
decreases to
4
ωL
. .
Since the resistor and inductor are in series, resistance of the circuit decreases.
Hence, current increases.
Flux through a closed circuit containing an inductor does not change instantaneously since the induced current in the circuit opposes the change in flux.
∴L(
R
E
)=
4
L
(i)⇒i=
R
4E
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