Electromagnetic Waves

Out of the following options which one can be used to produce a propagating electromagnetic wave?

In an electromagnetic wave in free space the root mean square value of the electric field is E_rms = 6 V/m. The peak value of the magnetic field is

An EM wave is propagating in a medium with velocity V = V î (along +x). The instantaneous oscillating electric field of this EM wave is along the +y axis. Then the direction of the oscillating magnetic field of the EM wave will be along

A parallel plate capacitor of capacitance 20 µF is being charged by a voltage source whose potential is changing at the rate of 3 V/s. The conduction current through the connecting wires and the displacement current through the plates of the capacitor would be, respectively,

For a transparent medium the relative permeability and permittivity µ_r and ε_r are 1.0 and 1.44 respectively. The velocity of light in this medium would be

Light with an average flux of 20 W/cm² falls on a non-reflecting surface at normal incidence having surface area 20 cm². The energy received by the surface during a time span of 1 minute is

The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is (c = speed of electromagnetic waves)

A capacitor of capacitance C is connected across an ac source of voltage V given by V = V₀ sin ωt. The displacement current between the plates of the capacitor would then be given by

For a plane electromagnetic wave propagating in the +x-direction, which one of the following combinations gives a correct possible pair of directions for the electric field (E) and magnetic field (B) respectively?

When light propagates through a material medium of relative permittivity ε_r and relative permeability µ_r, the velocity of light v is given by (c = velocity of light in vacuum)

Match List I (Electromagnetic waves) with List II (Wavelength) and choose the correct match. List I (a) AM radio waves (b) Microwaves (c) Infrared waves (d) X-rays List II (i) 10⁻¹⁰ m (ii) 10² m (iii) 10⁻² m (iv) 10⁻⁴ m Choose the correct match:

In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of 2.0 ×10¹⁰ Hz and amplitude 48 V/m. Then the amplitude of the oscillating magnetic field is (speed of light in free space = 3 ×10⁸ m/s)

ε₀ and µ₀ are the electric permittivity and magnetic permeability of free space respectively. If the corresponding quantities of a medium are 2ε₀ and 1.5µ₀ respectively, the refractive index of the medium will nearly be

To produce an instantaneous displacement current of 2 mA in the space between the parallel plates of a capacitor of capacitance 4 µF, the rate of change of applied variable potential difference (dV/dt) must be

An ac source is connected to a capacitor C. Due to a decrease in its operating frequency,

A parallel plate capacitor is charged by connecting it to a battery through a resistor. If I is the current in the circuit, then in the gap between the plates,

The property which is NOT of an electromagnetic wave travelling in free space is that

The electric field in a plane electromagnetic wave is given by E_z = 60 cos(5x + 1.5×10⁹ t) V/m. Then the expression for the corresponding magnetic field is (subscripts denote field direction)

A parallel plate capacitor made of circular plates is being charged such that the surface charge density on its plates is increasing at a constant rate with time. The magnetic field arising due to the displacement current is

An electromagnetic wave travelling in a lossless dielectric medium of dielectric constant $\varepsilon_r=9$ has electric field $E_x=E_0\sin(kz-2\pi\times10^{6}t)\,\text{Vm}^{-1}$, where $E_0$ is the amplitude and $k$ the wave vector. Among the following, the INCORRECT choice is:

Match List I (Electromagnetic wave) with List II (Production) and choose the correct match. List I (A) Microwave (B) Visible light (C) Gamma rays (D) Infrared List II (I) Electron transitions in atoms (II) Radioactive decay (nuclear transitions) (III) Vibration of atoms and molecules (IV) Klystron or magnetron valve Choose the correct match:

Match List-I with List-II: List-I P. Microwave Q. UV rays R. Gamma rays S. Radio wave List-II I. For purifying the water II. For warming the food III. For AM and FM communication systems IV. For treating the cancer cells The correct option is: