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

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Solution

(b) is correct, as if direction of current is changed the the direction of the magnetic field will be reversed, but there will be no change in strength of the magnetic field. Only polarity will change.

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