Magnetic field in a plane electromagnetic wave is given by B = B_0 (kx+ t) j T. Expression for corresponding electric field will be: (Where c is speed of light)

JEE Main 2017 Physics question

Magnetic field in a plane electromagnetic wave is given by T. Expression for corresponding electric field will be: (Where is speed of light)

(1) V m
(2) V m
(3) V mCorrect
(4) V m

Answer: (3)

Solution

Three facts fix the answer. **Magnitude:** in free space , so the amplitude is — this eliminates option (4), where the amplitude is . **Phase:** and oscillate in phase and with the same argument, so the wave travels in the direction; option (2), with

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Question ID VK-115785