Assertion :In electromagnetic waves electric field and magnetic field are perpendicular to each other. Reason: Electric field and magnetic field are self sustaining.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
In electromagnetic waves, electric field and magnetic field are perpendicular to each other and to the direction of propagation of the wave. Direction of propagation is given by $^n =^E \times^B$ .
Electric field collapses as soon as the source is removed, hence it is not self sustaining field. Magnetic field can magnetize ferromagnetic substances and hence their field is self sustaining.

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