JEE Physics - MCQ Practice Questions

Which of the following materials is diamagnetic?

The magnetic field at the center of a circular loop carrying current I with radius R is given by:

Two parallel wires carrying currents I₁ and I₂ in the same direction are separated by distance d. The force per unit length between them is:

A proton and an electron, both moving with the same velocity perpendicular to a uniform magnetic field, experience forces in the ratio:

The radius of circular motion of a charged particle in a magnetic field is r = mv/(qB). If the magnetic field is doubled, the radius becomes:

A solenoid has 1000 turns, length 1 m, and carries a current of 2 A. The magnetic field inside the solenoid is (μ₀ = 4π × 10⁻⁷ T·m/A):

A galvanometer can be converted into an ammeter by connecting a:

A conducting rod of length L moves with velocity v perpendicular to a magnetic field B. The induced EMF across the rod is:

A magnetic field B is perpendicular to a plane containing a circular loop of radius r. If the magnetic field increases uniformly from 0 to B₀ in time t, what is the magnitude of induced EMF in the loop?

Which of the following is NOT a property of magnetic field lines?

A straight wire carrying current I is placed in a uniform magnetic field B at an angle θ to the magnetic field. If the length of the wire is L, the magnetic force on the wire is:

Two parallel wires carry currents I₁ and I₂ in the same direction, separated by distance d. The force per unit length between them is:

A charged particle enters a uniform magnetic field with velocity perpendicular to the field. The particle will move in:

A solenoid has n turns per unit length and carries current I. The magnetic field inside the solenoid is:

The magnetic moment of a current loop is defined as:

An electron moves in a plane perpendicular to a uniform magnetic field. If the radius of its circular path is r, the momentum of the electron is:

A light ray travels from air into glass with refractive index 1.5. If the angle of incidence is 30°, what is the angle of refraction?

Which of the following phenomena demonstrates the wave nature of light?

The focal length of a convex lens is 15 cm. An object is placed at 30 cm from the lens. Find the position of the image.

What is the critical angle for total internal reflection when light travels from glass (n=1.5) to air (n=1)?