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1.
If 
and 
represent the permittivity and permeability of vacuum and 
and 
represent the permittivity and permeability of medium, then refractive index of the medium is given by
and represent the permittivity and permeability of vacuum and and represent the permittivity and permeability of medium, then refractive index of the medium is given by
2.
A capacitor having a capacity of 2 pF. Electric field across the capacitor is changing with a value of 
. The displacement current is
. The displacement current is
3.
The magnetic field between the plate of a capacitor when 
is given by
is given by
4.
A circular ring of radius 
is placed in a homogenous magnetic field perpendicular to the plane of the ring. The field 
chnages with time according to the equation 
, where 
is a constant and 
is the time. The electric field in the ring is
is placed in a homogenous magnetic field perpendicular to the plane of the ring. The field chnages with time according to the equation , where is a constant and is the time. The electric field in the ring is
5.
The frequency 1057 MHz of radiation arising from two close energy levels in hydrogen belongs to