Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-numerical-Hard-Class 12
A plane electromagnetic wave travels in free space with a frequency of 25 MHz. If the electric field at a certain point is 6.3 V/m, what is the magnitude of the magnetic field at that point?
A
2.1 x 10^-8 T
B
6.3 x 10^-8 T
C
2.1 x 10^-7 T
D
6.3 x 10^-7 T
Correct Answer
Option A
Detailed Explanation
The magnitude of the magnetic field B is given by B = E/c, where E = 6.3 V/m and c = 3 x 10^8 m/s. Therefore, B = 6.3 / (3 x 10^8) = 2.1 x 10^-8 T.
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