JEE Physics - MCQ Practice Questions

A circular loop and a square loop of equal perimeter are placed in the same uniform magnetic field. Their magnetic moments are:

A charged particle moves in crossed electric and magnetic fields. For the particle to move undeflected, the condition is:

The magnetic field inside a toroid with N turns, major radius R, and carrying current I is:

Two identical coils are placed coaxially with separation much larger than their radius. Their mutual inductance is:

The Hall effect in semiconductors is used to determine:

The magnetic field at the center of a circular arc of radius R subtending angle θ at the center and carrying current I is:

A toroidal magnetic field is produced by a toroid with N turns carrying current I. If the mean radius of the toroid is R and the cross-sectional area of the core is A, the magnetic energy stored is:

An alpha particle (charge +2e, mass 4u) and a proton (charge +e, mass u) are accelerated from rest through the same potential difference. They then enter a uniform magnetic field perpendicular to their motion. The ratio of their radii of curvature is:

The phenomenon where the inductance of a coil changes with the current flowing through it due to non-linear magnetic properties of the core is called:

A magnetic field B is applied perpendicular to a conductor carrying current I. The Hall coefficient is related to:

A charged particle enters a uniform magnetic field region at an angle θ to the field direction. Its trajectory is:

A superconductor exhibits the Meissner effect, which means:

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 proton and an alpha particle (He²⁺ nucleus) are accelerated through the same potential difference. They are then made to move perpendicular to a uniform magnetic field. The ratio of their radii of curvature is:

A rectangular loop of dimensions a × b is placed in a non-uniform magnetic field where B varies as B = B₀(1 + kx), where x is the distance from a reference line. The net force on the loop is:

A charged particle enters a region with perpendicular electric and magnetic fields with velocity v. For the particle to pass undeflected, the condition is:

A solenoid with N turns, length L, and cross-sectional area A is wound with wire of resistance R. When connected to a voltage source V, the magnetic energy stored is: