First slide

Electromagnetic waves and its nature

Question

An electromagnetic wave with poynting vector $6 w a t t m^{- 2}$ is absorbed by a surface of area $12 m^{2}$ . The force on the surface is $_______\times 10^{- 8} N$

Easy

Solution

Force ‘F’ exerted by electromagnetic wave on an absorbing surface of area ‘A’ is given by
$F = P A$ but $P = I / C$
$F = \frac{I}{C} A = \frac{6 \times 12}{3 \times 10^{8}} = 24 \times 10^{- 8} N$

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