JEE Physics - MCQ Practice Questions

A rectangular loop of wire with dimensions 5 cm × 10 cm is placed in a uniform magnetic field of 2 T perpendicular to its plane. If the loop is rotated by 90° in 0.1 s, what is the average induced EMF?

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: