In an electromagnetic wave, the direction of the magnetic field induction is
(1) parallel to electric field
(2) perpendicular to electric field
(3) antiparallel to Poynting vector
(4) random
In an electromagnetic wave
(1) Power is transmitted along the magnetic field
(2) Power is transmitted along the electric field
(3) Power is equally transferred along with the electric and magnetic fields
(4) power is transmitted in a direction perpendicular to both the fields
For any E.M. wave if E = 100 V/m and the magnetising field is equal to 0.265 A/m. Then the rate of maximum energy flow per unit area is:
(1)
(2) 26.5 W/
(3)
(4) None of these
A variable frequency AC source is connected to a capacitor. Then on increasing the frequency:
1. | Both conduction current and displacement current will increase |
2. | Both conduction current and displacement current will decrease |
3. | Conduction current will increase and displacement current will decrease |
4. | Conduction current will decrease and displacement current will increase |
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
The dimension of E/H is that of
(1) Impedance
(2) Inductance
(3) capacitance
(4) InductanceCapacitance
Which one statement is incorrect about the electromagnetic waves?
(1) gives always the direction of propagation
(2) is always perpendicular to
(3) Transverse in nature
(4) is always parallel to
Instantaneous displacement current of \(2.0\) A is set up in the space between two parallel plates of \(1~\mu \text{F}\) capacitor. The rate of change in potential difference across the capacitor is:
1. \(3\times 10^{6}~\text{V/s}\)
2. \(4\times 10^{6}~\text{V/s}\)
3. \(2\times 10^{6}~\text{V/s}\)
4. None of these
Which statement is incorrect?
1. | Speed of light in free space \(=\frac{1}{\sqrt{\mu_0 \epsilon_0}}\) |
2. | Speed of light in the medium \(=\frac{1}{\sqrt{\mu \epsilon}}\) |
3. | \(\frac{E_0}{B_0}=c\) |
4. | \(\frac{B_0}{E_0}=c\) |