NEET Physics Electromagnetic Waves Class 12 Questions

The magnetic energy stored in an inductor of inductance 4μH carrying a current of 2A is

The dimensions of magnetic flux are

Match List I with List II:

If μ₀ = permeability of free space & ε₀ = permittivity of free space. Find the value of μ₀ε₀.

Identify the correct statements from the following descriptions of various properties of electromagnetic waves. A. In a plane electromagnetic wave electric field and magnetic field must be perpendicular to each other and direction of propagation of wave should be along electric field or magnetic field. B. The energy in electromagnetic wave is divided equally between electric and magnetic fields.

Beams of electrons and protons move parallel to each other in the same direction. They

The energy density associated with electric field E̅ and magnetic field B̅ of an electromagnetic wave in free space is given by (ε₀ - permittivity of free space, μ₀ permeability of free space)

An electromagnetic wave propagating along north has its electric field vector upwards. Its magnetic field vector point towards

Lenz's law is consequence of the law of conservation of

A copper ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet while it is passing through the ring is

A square of side L metres lies in the xy-plane in a region, where the magnetic field is given by B = B₀(2î + 3ĵ + 4k̂)T, where B₀ is constant. The magnitude of flux passing through the square is

The self inductance L of a solenoid of length l and area of cross-section A, with a fixed number of turns N increases as

Point out the correct direction of magnetic field in the given figure.

If E and B represent electric and magnetic field vectors of the electromagnetic wave, the direction of propagation of electromagnetic wave is along

A 220 V ac supply is connected between points A and B as shown in figure. What will be the potential difference V across the capacitor?

Two batteries of emf $\varepsilon_1$ and $\varepsilon_2$ ($\varepsilon_2 > \varepsilon_1$) and internal resistances $r_1$ and $r_2$ respectively are connected in parallel as shown in figure.

An electromagnetic wave can be produced, when charge is

The magnetic field of a plane electromagnetic wave is given by: B⃗ = 2×10⁻⁸ sin(0.5×10³x + 1.5×10¹¹t)ĵT. The amplitude of the electric field would be:

Which of the following will have the dimensions of time:

A laser beam has intensity of 4.0 × 10¹⁴ W/m². The amplitude of magnetic field associated with beam is _______. (Take ε₀ = 8.85 × 10⁻¹²C²/Nm² and c = 3 × 10⁸ m/s)

If electron is moving from A to B in wire AB, then current induced in the coil is

The electric field of an electromagnetic wave travelling through a medium is given by E(x,t) = 25sin(2.0×10⁻¹⁵t−10⁷x)k̂ then the refractive index of the medium is (All given measurement are in SI units)

Which of the following combinations has the dimension of electrical resistance (ε₀ is the permittivity of vacuum and μ₀ is the permeability of vacuum)?

Select the incorrect statement from the following:

What is the primary characteristic that differentiates various types of electromagnetic waves?

What is the term used to describe the current associated with a changing electric field?

What is the speed of light as stated in the context of electromagnetic waves?

What is the wavelength range for X-rays in the electromagnetic spectrum?

What is the origin of the displacement current as proposed by Maxwell?

What is the primary factor that differentiates various types of electromagnetic waves?

What is the wavelength range of X-rays in the electromagnetic spectrum?

What are infrared waves often referred to as due to their ability to increase thermal motion in materials?

Who was the first to produce and detect electromagnetic waves in the laboratory?

What is the nature of the current inside a parallel plate capacitor according to Maxwell's theory?

Who was the first to experimentally demonstrate the existence of electromagnetic waves?

Which type of electromagnetic wave is typically produced by accelerating electrons in a circuit?

What type of electromagnetic waves are produced by hot bodies and molecules?

What is the relationship between the angular frequency (ω) and the wave vector (k) in electromagnetic waves as derived from Maxwell's equations?

Which of the following statements about electromagnetic waves is correct?

Which of the following statements about electromagnetic waves is correct?

Which of the following statements about electromagnetic waves is correct?

Which of the following statements about electromagnetic waves is correct?

Which of the following statements about electromagnetic waves is correct?

Which of the following statements about electromagnetic waves and their properties is correct?

Which of the following statements about electromagnetic waves and their properties is correct?

Which of the following statements about displacement current and conduction current in a parallel plate capacitor is correct?

Which combination of statements about electromagnetic waves is correct?

Assertion (A): Gamma rays have shorter wavelengths than radio waves.

Reason (R): Gamma rays originate from atomic nuclei, whereas radio waves are produced by accelerating electrons in a circuit.

Assertion (A): A time-varying electric field can generate a magnetic field.

Reason (R): Maxwell suggested an inconsistency in Ampere’s circuital law which led to this conclusion.

Assertion (A): Infrared waves contribute to the greenhouse effect.

Reason (R): Infrared waves are absorbed by water molecules, increasing their thermal motion.