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Q.

The magnetic field in a travelling electromagnetic wave has a peak value of 20 nT. The peak value of electric field strength is (in V/m):

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answer is 6.

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Detailed Solution

From question,

$B_{0} = 20 nT = 20 \times 10^{- 9} T$ ( $∵$ Velocity of light in Vacuum $C = 3 \times 10^{8} {ms}^{- 1}$ )

${\vec{E}}_{0} = {\vec{B}}_{0} \times \vec{C} |{\vec{E}}_{0}| = | \vec{B} | \cdot | \vec{C} | = 20 \times 10^{- 9} \times 3 \times 10^{8} = 6 V / m$ .

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