Homework Answers
According to faraday's law of electromagnetic induction, emf induced in a loop is equal to the time rate of change of magnetic flux.
So, if magnetic field is changing, emf will be induced in the coil which will cause a current.So, second option is correct.
First option is incorrect because electric and magnetic phenomena are closely related.Changing electric field causes magnetic field while changing magnetic field causes electric field.
Third option is incorrect because all magnetic fields won't cause a current. Only changing magnetic field will do.
Fourth option is incorrect because although electric currents cause magnetic field,but changing magnetic field can also cause electric current.
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