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Question

# A laser beam has intensity 2.5×1014 Wm−2. The amplitudes of electric and magnetic fields in the beam are :

A
1.44×108 N/C, 4.34 T
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B
4.34 N/C, 1.44 T
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C
4.34×108 N/C, 1.44×102 T
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D
4.34×108 N/C, 1.44 T
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Solution

## The correct option is D 4.34×108 N/C, 1.44 TWe know that formula for the intensity is given by: I=12ε0E2c ⇒E=√2Iε0c Here, I=2.5×1014 W/m2, ε0=8.85×10−12 C2/Nm2 c=3×108 m/s E=√2×2.5×10148.85×10−12×3×108=4.34×108 N/C The magnetic field is given by: B=Ec=4.34×1083×108=1.44 T Hence, (D) is the correct answer.

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