The magnetic field of an electromagnet can be increased by …………… in the solenoid and by ……………through the solenoid.
(a) increasing the number of turns, decreasing the current.
(b) decreasing the number of turns, increasing the current.
(c) decreasing the number of turns, decreasing the current.
(d) increasing the number of turns, increasing the current.

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(d) increasing the number of turns, increasing the current
Reason — The strength of a magnet can be increased by —

Increasing the number of turns of windings in the solenoid.
Increasing the current through the solenoid.

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