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Electromagnetic Waves

The size of a...

Question

The size of antenna should be at least .

A

λ

/10

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B

λ

/4

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C

λ

/5

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Solution

The correct option is B $λ$ /4
For transmitting a signal, we need an antenna or an aerial. This antenna should have a size comparable to the wavelength of the signal (at least λ/4 in dimension) so that the antenna properly senses the time variation of the signal.

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