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Q.

A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100 W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 10 m from the lamp will be

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a

1.34 V/m

b

2.68 V/m

c

5.36 V/m

d

9.37 V/m

answer is A.

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Detailed Solution

Sav=12ε0cE02=P4πR2⇒E0=P2πR2ε0c=32 × 3.14 × 100 × 8.85 × 10−12 × 3 × 108 = 1.34 V/m
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