Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-numerical-Medium-Class 12
In a plane electromagnetic wave traveling through free space, if the electric field E is given as 6.3 V/m along the y-direction, what is the magnitude and direction of the magnetic field B at the same point, considering the wave propagates along the x-direction?
A
1 × 10⁻⁸ T along the z-direction
B
1 × 10⁻⁸ T along the y-direction
C
2 × 10⁻⁷ T along the z-direction
D
2 × 10⁻⁷ T along the x-direction
Correct Answer
Option A
Detailed Explanation
Using the relation B = E/c, where c is the speed of light (3 × 10⁸ m/s), B = 6.3 V/m / 3 × 10⁸ m/s = 2.1 × 10⁻⁸ T. Since the wave travels along the x-axis and E is along the y-axis, B must be perpendicular to both, i.e., along the z-axis.
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