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:

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

A magnetic field B is applied perpendicular to a current-carrying wire of length L carrying current I. The magnetic force on the wire is F = BIL sin θ. What is the angle θ when the force is maximum?

The SI unit of magnetic field intensity is Tesla. One Tesla is equivalent to which of the following?

An electron moves in a circular path in a perpendicular magnetic field. Which quantity remains constant during its motion?

A charged particle with charge q and mass m enters a magnetic field region with velocity v perpendicular to B. The radius of circular motion is given by:

The magnetic flux through a surface is Φ = ∫B·dA. For a uniform field B perpendicular to a rectangular surface of area 2 m², with B = 0.5 T, the flux is:

According to Lenz's law, the induced EMF in a coil opposes the change in magnetic flux. If the flux through a coil increases at a rate of 0.1 Wb/s and the coil has 100 turns, the induced EMF is:

The magnetic field due to a solenoid inside and outside differs significantly. Which statement is correct?

A magnetic dipole of moment M is placed in a uniform magnetic field B. The torque experienced by the dipole when it makes an angle θ with the field is:

The magnetic field intensity at a distance r from a long straight current-carrying wire is:

A proton moving with velocity v perpendicular to a magnetic field B follows a circular path. The radius of this path is:

Two parallel wires carrying currents I₁ and I₂ in the same direction, separated by distance d. The force per unit length between them is:

A charged particle with charge q and mass m moves in a magnetic field. The cyclotron frequency is:

The magnetic moment of a current loop carrying current I with area A is:

A transformer has primary coil with N₁ turns and secondary coil with N₂ turns. The voltage ratio is: