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The magnetic field in a travelling electromagnetic wave has a peak value of 20 nT. The peak value of electric field strength is

A) 3 V/m

B) 6 V/m

C) 9 V/m

D) 12 V/m

Option B

Peak value of electric field

$E_{0}=B_{0}c= 20\times10^{-9}\times 3\times10^{8}$

=6 V/m

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