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Question

A laser beam has intensity 2.5×1014 Wm2. The amplitudes of electric and magnetic fields in the beam are,

A
1.25×108 N/C,4.34 T
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B
4.34×108 N/C,1.44 T
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C
1.44×108 N/C,4.34 T
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D
4.34 N/C,1.44 T
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Solution

The correct option is B 4.34×108 N/C,1.44 T
We know that the intensity is given by,
I=12ϵ0E2 c
E=2Iϵ0 c

Here, I=2.5×1014 Wm2
c=3×108 m/s
ϵ0=8.85×1012 C2/N-m2

E=2×2.5×10148.85×1012×3×108

E=4.34×108 N/C

The magnetic field is given by,
B=Ec=4.34×1083×108=1.44 T

Hence, (C) is the correct answer.

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