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Question

A beam has intensity 2.5×1014Wm2. The ratio of electric and magnetic fields in the beam is

A
3.44T
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B
3.14T
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C
1.004T
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D
1.44T
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Solution

The correct option is D 1.44T
I=2.5×1014W/m2Weknow,I=12e0E20CE20=2Ie0CorE0=2Ie0CE0=2×2.5×10148.85×1012×3×108=0.4339×109=4.33×108N/C.B0=μ0E0CE0=4×3.14×107×8.854×1012×3×108×4.33×108=1.44T
Hence, Option D is correct .

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