JEE Physics - MCQ Practice Questions

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:

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:

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:

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

The self-inductance of a solenoid depends on:

A charged particle moves in a helical path in a uniform magnetic field. This happens when the particle's velocity has:

In a Hall effect experiment with a rectangular conductor in a magnetic field, the Hall voltage is proportional to:

A rectangular loop is placed in a non-uniform magnetic field. The loop will experience:

The energy density of a magnetic field is given by:

Two coils have self-inductances L₁ and L₂ with coupling coefficient k. Their mutual inductance is:

A particle with charge q and mass m undergoes circular motion in a magnetic field. Its cyclotron frequency is independent of:

The magnetic field between the poles of a permanent magnet is approximately:

A rectangular conducting loop ABCD with sides a and b is rotated with angular velocity ω in a uniform magnetic field B perpendicular to the plane of rotation. The induced EMF is:

Two magnets are placed with their north poles facing each other. The force between them varies with distance r as:

A conducting rod of length L moves with velocity v perpendicular to its length in a magnetic field B. The motional EMF induced is maximum when:

The magnetic susceptibility of a paramagnetic material is: