Q3 of 30 Page 338

Can an electromagnetic wave be deflected by an electric field? By a magnetic field?

Electromagnetic waves are made up of electric and magnetic fields but not charges. When an electromagnetic wave passes from a region of electric or magnetic field, it will show no deflection as no charge is present which would experience a force due to these fields and be deflected.


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1

In a microwave oven, the food is kept in a plastic container and the microwave is directed towards the food. The food is cooked without melting or igniting the plastic container. Explain.

 2

A metal rod is placed along the axis of a solenoid carrying a high-frequency alternating current. It is found that the rod gets heated. Explain why the rod gets heated?

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A wire carries an alternating current i = i0sinωt. Is there an

electric field in the vicinity of the wire?


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A capacitor is connected to an alternating-currents source. Is there a magnetic field between the plates?