JEE Physics - MCQ Practice Questions

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:

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:

A conducting rod of mass m slides on two parallel rails separated by distance d in a magnetic field B perpendicular to the plane. If the rod moves with constant velocity v, the magnetic force on it is:

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

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

The mutual inductance between two coils depends on:

An electron (charge -e) and a proton (charge +e) move perpendicular to the same uniform magnetic field with the same velocity. The ratio of their radii of curvature is:

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

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

When a conductor moves through a magnetic field, an EMF is induced. This is due to the Lorentz force on:

A paramagnetic material placed in a magnetic field becomes magnetized. This is because:

An inductor with inductance L and a resistor with resistance R are connected in series with a DC source. The time constant is:

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

The energy stored in a magnetic field of an inductor carrying current I is:

A superconductor exhibits the Meissner effect, which means: