Q.

Identify the correct statements from the following descriptions of various properties of electromagnetic waves.

A. In a plane electromagnetic wave electric field and magnetic field must be perpendicular to each other and direction of propagation of wave should be along electric field or magnetic field.

B. The energy in electromagnetic wave is divided equally between electric and magnetic fields.

C. Both electric field and magnetic field are parallel to each other and perpendicular to the direction of propagation of wave.

D. The electric field, magnetic field and direction of propagation of wave must be perpendicular to each other.

E. The ratio of amplitude of magnetic field to the amplitude of electric field is equal to speed of light.

Choose the most appropriate answer from the options given below:

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a

D only

b

A, B and E only

c

B and D only

d

B, C and E only

answer is B.

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Detailed Solution

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Uavelectric field =12ε0E02=12ε0cB02  E0=cB0 We know that, c=1μ0ε0 Uav Electric field =12ε0×1μ0ε0B02=12B02μ0=Uavmagnetic field 

Thus, we can say, the energy in electromagnetic wave is divided equally between electric and magnetic fields.

Question Image

The electric field, magnetic field and direction of propagation of wave are perpendicular to each other.

S=1μ0E×B

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Identify the correct statements from the following descriptions of various properties of electromagnetic waves.A. In a plane electromagnetic wave electric field and magnetic field must be perpendicular to each other and direction of propagation of wave should be along electric field or magnetic field.B. The energy in electromagnetic wave is divided equally between electric and magnetic fields.C. Both electric field and magnetic field are parallel to each other and perpendicular to the direction of propagation of wave.D. The electric field, magnetic field and direction of propagation of wave must be perpendicular to each other.E. The ratio of amplitude of magnetic field to the amplitude of electric field is equal to speed of light.Choose the most appropriate answer from the options given below: