AIPMT Prelims Physics Electromagnetic Waves Class 12 Questions

A coil of resistance 400 Ω is placed in a magnetic field. If the magnetic flux ϕ (wb) linked with the coil varies with time t (sec) as ϕ = 50 t² + 4, the current in the coil at t = 2 sec is

The electric field associated with an e.m. wave in vacuum is given by E̅ = î40cos(kz − 6 × 10⁸t), where E, z and t are in volt/m, meter and seconds respectively. The value of wave vector k is

The electric and the magnetic field, associated with an e.m. wave, propagating along the +z-axis, can be represented by

An electric field and a magnetic field are acting along the same direction in certain region. If an electron is projected in the region such that its velocity is pointed along direction of fields, then the electron

Photoelectric emission occurs only when the incident light has more than a certain minimum

Which of the following statement is false for the properties of electromagnetic waves?

A beam of cathode rays is subjected to crossed Electric (E) and Magnetic field (B). The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (where V is the potential difference between cathode and anode)

The electric field part of an electromagnetic wave in a medium is represented by Eₓ = 0; Eᵧ = 2.5 N/C cos [(2π × 10⁶ rad/m) t − (π × 10⁻² rad/s) x]; E𝓏 = 0. The wave is:

The velocity of electromagnetic radiation in a medium of permittivity ε₀ and permeability μ₀ is given by :

A circular disc of radius 0.2 metre is placed in a uniform magnetic field of induction $\frac{1}{\pi} \frac{Wb}{m^2}$ in such a way that its axis makes an angle of 60° with $\vec{B}$. The magnetic flux linked with the disc is -

In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential V and then made to describe semicircular path of radius R using a magnetic field B. If V and B are kept constant, the ratio (charge on the ion / mass of the ion) will be proportional to

The electric and magnetic field of an electromagnetic wave are

Which of the following ray are not electromagnetic waves

Which is having minimum wavelength :-

What is the cause of “Green house effect” :-

To convert a galvanometer into a voltmeter one should connect a :-

A charge 'q' moves in a region where electric field and magnetic field both exist, then force on it is :-

The velocity of electromagnetic wave is parallel to :-

In Thomson mass spectrograph 𝐄 ⊥ 𝐁 then the velocity of undeflected electron beam will be :

A capacitor of capacity C and reactance X if capacitance and frequency become double then reactance will be :-

For a coil having L = 2 mh, current flow through it is I = t² e⁻ᵗ then the time at which emf become zero :-

The frequency order of for γ-rays (b), X⁻rays (a), UV⁻rays (c) :