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The strength of the magnetic field between the poles of an electromagnet would be unchanged if:
(a) current in the electromagnet winding were doubled
(b) direction of current in electromagnet winding were reversed
(c) distance between the poles of electromagnet were doubled
(d) material of the core of electromagnet were changed
(b) direction of current in electromagnet winding were reversed
Explanation
The options other than b, the strength of the magnetic field between the poles of an electromagnet can change because the strength of magnetic field produced by a solenoid depends on the number of turns, current and material of the core of the electromagnet.
Updated on: 10-Oct-2022
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