Q.

The electric field of a plane electromagnetic wave varies with time of amplitude 2Vm-1  propagating along z-axis. The average energy density of the magnetic field is (in J m-3)

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a

13.29×10-12

b

8.86×10-12

c

17.72×10-12

d

4.43×10-12

answer is B.

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Detailed Solution

E=2vm-1 12ε0E022=uE &uB  are  same128.85×10-12222×B8.85×10-12J/m3
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The electric field of a plane electromagnetic wave varies with time of amplitude 2Vm-1  propagating along z-axis. The average energy density of the magnetic field is (in J m-3)