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Question

Find the energy contained in a cylinder of cross section 10cm2 and length 50cm along x-axis, if E=50sinω(tx/C) be the electric field in an electromagnetic wave

A
5.5×1012J
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B
1.5×1011J
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C
6.2×!010J
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D
1.1×1015J
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Solution

The correct option is A 5.5×1012J
Energy density, Uav=12ε0E20

=12×8.85×1012×502 = 1.1×108J/m3

Volume, V=10×50=5×104m3

So, energy =UavXV=5.5×1012J


1229275_1505019_ans_dc6ecd39fa6b46cc88e3822fd1f23c1b.png

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