NEET2025Physics-Electromagnetism
NEET 2025 Physics Electromagnetic Waves MCQ Question
Type: MCQ-numerical-Easy-Class 12
The electric field in a plane electromagnetic wave is given by Eₓ = 60cos (5x + 1.5×10⁹t)V/m. Then expression for the corresponding magnetic field is (here subscripts denote the direction of the field):
A
Bᵧ = 2×10⁻⁷ cos (5x + 1.5×10⁹t)T
B
Bₓ = 2×10⁻⁷ cos (5x + 1.5×10⁹t)T
C
Bᶻ = 60cos (5x + 1.5×10⁹t)T
D
Bᵧ = 60sin (5x + 1.5×10⁹t)T
Correct Answer
Option A
Detailed Explanation
Using the relation B = E/c, where c is the speed of light, the magnetic field is calculated. The correct expression is Bᵧ = 2×10⁻⁷ cos (5x + 1.5×10⁹t)T.
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