The electric field in a plane electromagnetic wave is given by E z = 60 (5x + 1.5 10 9 t) V/m . Then expression for the corresponding magnetic field is (here subscripts denote the direction of the field) :

1. A. B y = 60 (5x + 1.5 10 9 t) T
2. B. B y = 2 10 -7 (5x + 1.5 10 9 t) T
3. C. B x = 2 10 -7 (5x + 1.5 10 9 t) T
4. D. B z = 60 (5x + 1.5 10 9 t) T

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