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NEET 2025

NEET 2025 Physics question on Electromagnetic Waves

The electric field in a plane electromagnetic wave is given by Ez=60cos⁡(5x+1.5×109t)E_z = 60 \cos (5x + 1.5 \times 10^9 t) V/m. Then expression for the corresponding magnetic field is (here subscripts denote the direction of the field) :
  1. A.
    By=60sin⁡(5x+1.5×109t)B_y = 60 \sin (5x + 1.5 \times 10^9 t) T
  2. B.
    By=2×10−7cos⁡(5x+1.5×109t)B_y = 2 \times 10^{-7} \cos (5x + 1.5 \times 10^9 t) T
  3. C.
    Bx=2×10−7cos⁡(5x+1.5×109t)B_x = 2 \times 10^{-7} \cos (5x + 1.5 \times 10^9 t) T
  4. D.
    BZ=60cos⁡(5x+1.5×109t)B_Z = 60 \cos (5x + 1.5 \times 10^9 t) T
Show answer

Correct option: B

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