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How can a magnetic field be produced?

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How can a magnetic field be produced?

(a) Using a permanent magnet

(b) Electric current

(c) Using a temporary magnet

(d) Using a permanent magnet or electric current

The question was asked in exam.

The above asked question is from Magnetic Field in division Electromagnetism of Basic Electrical Engineering

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Right option is (d) Using a permanent magnet or electric current

Explanation: An electric current as well as the permanent magnet produces a magnetic field whereas a temporary magnet fails to do so.

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