Out of the following options which one can be used to produce a propagating electromagnetic wave?
1. A stationary charge
2. A chargeless particle
3. An accelerating charge
4. A charge moving at constant velocity
Statement I: A changing electric field produces a magnetic field.
Statement II: A changing magnetic field produces an electric field.
(1) If both statement-I and Statement-II are true, and Statement-II is the correct explanation of Statement-I.
(2) If both Statement-I and Statement-II are true but Statement-II is not the correct explanation of Statement-I.
(3) If Statement-I is true but Statement-II is false.
(4) If Statement-I is false but Statement-II is true.
The relation between electric field E and magnetic field intensity H in an electromagnetic wave is:
(1) E = H
(2)
(3)
(4)
Source of an electromagnetic wave is
(1) A charge moving with constant velocity
(2) A charge at rest
(3) A charge moving in a circular orbit
(4) Charges cannot produce an EM wave
An accelerated charge :
(1) emits an electromagnetic wave
(2) does not emit electromagnetic wave
(3) produces a gravitational field
(4) None of these
If a source is transmitting an electromagnetic wave of frequency , then the wavelength of the electromagnetic wave transmitted from the source will be:
1. | 36.6 m | 2. | 40.5 m |
3. | 42.3 m | 4. | 50.9 m |
A circular ring of radius r is placed in a homogeneous magnetic field perpendicular to the plane of the ring. The field B changes with time according to the equation B = Kt, where K is a constant and t is the time. The electric field in the ring is
(1)
(2)
(3)
(4)
What is the energy density of electric field at a distance of 5 m from a point source of EM wave, if the electric field strength at that point be 100 V/m ?
(1) 44 x 10-9 J/m3
(2) 11 x 10-9 J/m3
(3) 22 x 10-9 J/m3
(4) 88 x 10-9 J/m3
The impulse imparted by an electromagnetic pulse of energy 1.5 x 10-2 joule when it falls normally on a perfectly reflecting surface is
1. 4 x 10-10 kg-m/s
2. 2 x 10-10 kg-m/s
3.10-10 kg-m/s
4. 0.5 x 10-10 kg-m/s
Electromagnetic waves are produced by:
1. | static charges. |
2. | charges in uniform motion. |
3. | an oscillating charge. |
4. | both (2) & (3) |