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When electromagnetic waves enter the ionised layer of ionosphere, then the relative permittivity , dielectric constant dielectric constant of the ionised layer
Does not change
Appears to increase
Appears to decrease
Sometimes appears to increase and sometimes to decrease
The dimensional formula of is
The dimensional formula of coefficient of permittivity for free space in the equation where symbols have their usual meanings, is
The quantity is the permittivity of free space, L is length, V is potential difference and t is time. The dimensions of X are same as that of
Resistance
Current
Power
(Power Γ Velocity)/Current
The dimensions of are same as
electric field intensity
electric flux density
pressure
electric potential
The physical quantities not having same dimensions are
Torque and work
Momentum and Planckβs constant
Stress and Youngβs modules
Speed and