Question
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
Solution
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
