A parallel plate capacitor with plate area \(A\) and separation between the plates \(d\), is charged by a source having current \(i\) at some instant. Consider a plane surface of area \(A/2\) parallel to the plates and drawn symmetrically between the plates. The displacement current through this area is:
1. \(i\)
2. \(i/2\)
3. \(i/4\)
4. \(i/8\)
The sun delivers of electromagnetic flux to the earth's surface. The total power that is incident on a roof of dimensions 8 m20 m will be:
1.
2.
3.
4. 1.6
In a region of free space, the electric field at some instant of time is V/m and the magnetic field is . The Poynting vector for these fields is
(1)
(2)
(3)
(4)
A plane electromagnetic wave propagating in the x-direction has wavelength of 60 mm. The electric field is in the y-direction and its maximum magnitude is 33 V/. The equation for the electric field as function of x and t is
(1) 11 sin (t - x/c)
(2) 33 sin (t - x/c)
(3) 33 sin (t - x/c)
(4) 11 sin (t - x/c)
In an electromagnetic wave, if the electric field oscillated sinusoidally with an amplitude of 48 V, then the RMS value of the oscillating magnetic field will be:
1.
2.
3.
4.
The magnetic field in the plane electromagnetic wave is given by
The expression for the electric field will be
(1)
(2)
(3)
(4)
A larger parallel plate capacitor, whose plates have an area of 1 , separated from each other by 1 mm, is being charged at a rate of 25.8 V/s. If the plates have dielectric constant 10, then the displacement current at this instant is:
1. 25
2. 11
3. 2.2
4. 1.1
The magnetic field between the plates of radius 12 cm separated by a distance of 4 mm of a parallel plate capacitor of capacitance 100 pF along the axis of plates having conduction current of 0.15 A is
(1) zero
(2) 1.5 T
(3) 15 T
(4) 0.15 T
A plane electromagnetic wave
propagates in a medium of dielectric constant
(1) 1.5
(2) 2.0
(3) 2.4
(4) 4.0
The energy of the X-rays photon is 3.3J. Its frequency is :
(1)
(2)
(3)
(4)