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Current Electricity
Question
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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 :

  • 3 V/m

  • 6 V/m

  • 9 V/m

  • 12 V/m

Answer

B.

6 V/m

Ε = cB
Where E = electric field,
B = magnetic field
c = speed of EM waves
= 3 × 108 × 20 × 10–9 = 6 V/m

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