Electric and Magnetic Field Average Values in EM Waves – Rankers Physics
Topic: Electromagnetic Waves
Subtopic: Properties of EM Waves

Electric and Magnetic Field Average Values in EM Waves

Assertion (A): Average value of electric field and magnetic field in one cycle is same in electromagnetic waves.
Reason (R): The ratio of electric field intensity and magnetic field intensity of EM waves is equal to speed of EM waves.
 
Both (A) \(&\) (R) are true and the (R) is the correct explanation of the (A)
Both (A) \(&\) (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Solution:

In electromagnetic waves, the average energy density stored in the electric field is equal to the average energy density stored in the magnetic field over one cycle. Also, the ratio of electric field intensity to magnetic field intensity equals the wave's speed \(v\). Both statements are true, but the second does not explain the first.

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