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:

The self-inductance of a solenoid depends on:

A charged particle moves in a helical path in a uniform magnetic field. This happens when the particle's velocity has:

In a Hall effect experiment with a rectangular conductor in a magnetic field, the Hall voltage is proportional to:

A rectangular loop is placed in a non-uniform magnetic field. The loop will experience:

The energy density of a magnetic field is given by:

Two coils have self-inductances L₁ and L₂ with coupling coefficient k. Their mutual inductance is:

A particle with charge q and mass m undergoes circular motion in a magnetic field. Its cyclotron frequency is independent of:

A conducting rod AB of length 1 m moves with velocity 5 m/s perpendicular to a magnetic field of 2 T. If the rod makes an angle of 60° with the direction of motion, the induced EMF is:

A toroidal coil has N turns and inner radius r₁, outer radius r₂. The self-inductance is approximately:

In a cyclotron, the time period of revolution of a particle is independent of its energy because:

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?