JEE Physics - MCQ Practice Questions

An electron enters a region of uniform magnetic field with velocity v perpendicular to the field. If the magnetic field strength is B, the radius of curvature is:

Two parallel wires carrying currents I₁ and I₂ in opposite directions are separated by distance d. The force between them is:

A rectangular loop of dimensions a × b carrying current I is placed in a uniform magnetic field B. The maximum torque on the loop is:

The magnetic moment of an electron orbiting in the first Bohr orbit is approximately:

The magnetic field due to a long straight wire carrying current I at perpendicular distance r is:

A proton and an electron, both accelerated through the same potential difference, enter a uniform magnetic field perpendicularly. Which has a larger radius of curvature?

The period of revolution of a charged particle in a magnetic field is independent of:

A compass needle placed in a magnetic field experiences a maximum torque when the needle is:

The self-inductance of a solenoid with N turns, length L, and cross-sectional area A is:

A solenoid with 500 turns is 0.5 m long and carries a current of 2 A. The permeability of free space is μ₀ = 4π × 10⁻⁷ T·m/A. Calculate the magnetic field inside the solenoid.

Two parallel wires carry currents I₁ = 5 A and I₂ = 3 A in the same direction, separated by distance r = 0.1 m. The force per unit length between them is approximately:

A rectangular loop ABCD with sides 2 m × 3 m carries a current of 4 A and is placed in a uniform magnetic field of 0.5 T perpendicular to the plane of the loop. The magnetic torque on the loop is:

A long straight wire carries a current and produces a magnetic field. At a distance of 2 cm from the wire, the field is 4 × 10⁻⁵ T. What is the current in the wire? (μ₀ = 4π × 10⁻⁷ T·m/A)

The magnetic dipole moment of a current loop is defined as m = NIA, where N is the number of turns, I is current, and A is area. If a circular loop of radius 5 cm carries 2 A current, the magnetic dipole moment is approximately:

A beam of electrons is accelerated through a potential difference V and then enters a region of perpendicular electric and magnetic fields. For the electrons to move undeflected, which condition must be satisfied?

A conducting rod of length L = 0.5 m moves with velocity v = 10 m/s perpendicular to a uniform magnetic field B = 2 T. The motional EMF induced is:

In a cyclotron, a charged particle spirals outward as it gains energy. The frequency of revolution is independent of:

A rectangular conducting loop is partially inside a uniform magnetic field region. If the loop is pulled out with constant velocity v, the induced EMF depends on:

A rectangular coil of area A and N turns is rotated in a uniform magnetic field B with angular velocity ω. The maximum induced EMF is:

A solenoid of length L and cross-sectional area A has N turns. Its self-inductance is: