A plane electromagnetic wave travelling along the X-direction has a wavelength of 3mm. The variation in the electric field occurs in the Y-direction with an amplitude 66 Vm –1 . The equation for the electric and magnetic fields as a function of x and t are respectively.
A
E y = 33 cos π × 10 11 
, B z = 1.1 × 10 –7 cos π × 10 11 
, B z = 1.1 × 10 –7 cos π × 10 11
B
E y = 11 cos 2 π × 10 11 
, B y = 11 × 10 –7 cos 2 π × 10 11 
, B y = 11 × 10 –7 cos 2 π × 10 11
C
E x = 33 cos π × 10 11 
, B x = 11 × 10 –7 cos π × 10 11 
, B x = 11 × 10 –7 cos π × 10 11
D
E y = 66 cos 2 π × 10 11 
, B z = 2.2 × 10 –7 cos 2 π × 10 11 
, B z = 2.2 × 10 –7 cos 2 π × 10 11
Text Solution
Verified by ExpertsThe correct answer is:
D
Sol. E 0 = 66 Vm –1
B 0 = 
= 2.2 × 10 –7 T
Since electromagnetic wave is of transverse nature. Hence if electric field is along y-axis, then magnetic field must be in z-axis. Since propagation is x-axis. Hence correction option is .
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