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Question

A radio wave has a maximum magnetic field induction of 10-4T on arrival at a receiving antenna. The maximum electric field intensity of such a wave is


A

Zero

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B

3×104Vm

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C

5.8×10-9Vm

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D

3.3×10-13Vm

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Solution

The correct option is B

3×104Vm


Step 1. Given data:

maximum magnetic field induction B0 = 10-4T

Also, Speed of light c = 3×108ms

Step 2. Formula used:

maximum electric field intensity E0 = Velocity of light c X maximum magnetic field induction B0

E0=c.B0

Step 3. Calculations:

Putting the values in the given formula, we get,

Thus, E0=3×108×10-4=3×104Vm-1

Thus, the correct option is option B.


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