An electromagnetic wave is made up of joint electric (E) and
magnetic (B) fields. Its direction of propagation is
(a) parallel to E
(b) perpendicular to E but parallel to B
(c) parallel to B
(d) perpendicular to both E and B
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The electric field is always perpendicular to the magnetic field, and both fields are directed at right-angles to the direction of propagation of the wave. In fact, the wave propagates in the direction E ×B . Electromagnetic waves are clearly a type of transverse wave.
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Explanation:
In the following situations, identify the agent exerting the force. Also, state
the effect of the force in each case.
(a) Squeezing a piece of lemon between the fingers to extract its juice.
(b) A person diving into a swimming pool.
(c) A labourer moving a loaded cart.
(0) A car coming to rest once its engine is switched off.
te) An athlete making a high jump to clear a bar kept at a certain height.
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