Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-numerical-Easy-Class 12
A plane electromagnetic wave of frequency 25 MHz travels in free space along the x-direction. If the electric field E at a point is 6.3 V/m in the y-direction, what is the magnitude of the magnetic field B at that point?
A
1 x 10^-8 T
B
8.4 x 10^-8 T
C
5 x 10^-8 T
D
0 x 10^-8 T
Correct Answer
Option A
Detailed Explanation
Using the relationship B = E/c where c is the speed of light (3 x 10^8 m/s), B is calculated as 6.3 V/m divided by 3 x 10^8 m/s, resulting in 2.1 x 10^-8 T.
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