A parallel plate capacitor of capacitance \(20~\mu\text{F}\) is being charged by a voltage source whose potential is changing at the rate of \(3~\text{V/s}.\) The conduction current through the connecting wires, and the displacement current through the plates of the capacitor would be, respectively:
1. zero, zero
2. zero, \(60~\mu\text{A}\)
3. \(60~\mu\text{A},\) \(60~\mu\text{A}\)
4. \(60~\mu\text{A},\) zero

Which colour of the light has the longest wavelength?

The electric and magnetic fields of an electromagnetic wave are:

Light with an energy flux of \(25\times10^4\) Wm^–2 falls on a perfectly reflecting surface at normal incidence. If the surface area is \(15\) cm², the average force exerted on the surface is:
1. \(1.25\times 10^{-6}\) N
2. \(2.50\times 10^{-6}\) N$$
3. \(1.20\times 10^{-6}\) N$\mathrm{}$
4. \(3.0\times 10^{-6}\) N

An EM wave is propagating in a medium with a velocity \(\overrightarrow{{v}}={v} \hat{i}\). The instantaneous oscillating electric field of this EM wave is along the \(+y\) axis. The direction of the oscillating magnetic field of the EM wave will be along:
1. \(-z \text-\)direction
2. \(+z \text-\)direction
3. \(-y \text-\)direction
4.  \(+y \text-\)direction

Displacement current is the same as:

The maxwell's equation:

$\oint \overrightarrow{B}.\overrightarrow{dl}={\mu }_0\left(i+{\epsilon }_0.\frac{d{\varphi }_E}{dt}\right)$ is a statement of :

(1) Faraday's law of induction

(2) Modified Ampere's law

(3) Gauss's law of electricity

(4) Gauss's law of magnetism

The charge of a parallel plate capacitor is varying as; \(q = q_{0} \sin\omega t\). The magnitude of displacement current through the capacitor is:
(the plate Area = \(A\), separation of plates = \(d\))
1. \(q_{0}\cos \left(\omega t \right)\)
2. \(q_{0} \omega \sin\omega t\)
3. \(q_{0} \omega \cos \omega t\)
4. \(\frac{q_{0} A \omega}{d} \cos \omega t\)

An electromagnetic wave is propagating along Y-axis. Then:

(1) The oscillating electric field is along X-axis and the oscillating magnetic field is along Y-axis.

(2) The oscillating electric field is along Z-axis and the oscillating magnetic field is along X-axis.

(3) Both oscillating electric and magnetic fields are along Y-axis, but the phase difference between them is ${90}^{°}$

(4) Both oscillating electric and magnetic fields are mutually perpendicular in arbitrary directions.