JEE Physics - MCQ Practice Questions

A charged particle moves in a uniform magnetic field perpendicular to its velocity. Which of the following remains constant?

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

A bar magnet is cut into two equal halves along its length. The magnetic moment of each half is:

The SI unit of magnetic flux density is:

A solenoid of length L, cross-sectional area A, and N turns carries current I. The magnetic field inside the solenoid is:

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:

A moving charge experiences a magnetic force. This force is always:

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 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: