The property which is NOT of an electromagnetic wave travelling in free space is that:
medium
Electromagnetic Waves
2024
physics
They travel with a speed equal to μ0ε01.
They originate from charges moving with uniform speed.
They are transverse in nature.
The energy density in electric field is equal to energy density in magnetic field.
Explanation
To solve this problem, we need to analyze the properties of electromagnetic waves in free space.Let's examine each option:• Option 1: They travel with a speed equal to μ0ε01.
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This is a true statement. The speed of electromagnetic waves in free space is given by
c=μ0ε01,
where
μ0
is the permeability and
ε0
is the permittivity of free space.
• Option 2: They originate from charges moving with uniform speed.
This statement is false. Electromagnetic waves are generated by accelerating charges, not charges moving at a uniform speed.
• Option 3: They are transverse in nature.
This is true. Electromagnetic waves are transverse waves, meaning the electric and magnetic fields oscillate perpendicular to the direction of wave propagation.
• Option 4: The energy density in electric field is equal to energy density in magnetic field.
This is true. In an electromagnetic wave, the energy density of the electric field is equal to the energy density of the magnetic field.
Therefore, the property which is NOT of an electromagnetic wave travelling in free space is:
Option 2: They originate from charges moving with uniform speed.