A coil and a bulb are connected in series with a DC source, a soft iron core is inserted in the ... VIDEO
A coil and a bulb are connected in series with a DC source, a soft iron core is inserted in the coil, then
\( \mathrm{P} \)
the intensity of the bulb
W
(1) remains the same(2) decreases
(3) increases
(4) zero
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