JEE Physics - MCQ Practice Questions

An electron is released from rest in a uniform electric field of magnitude E. After moving through a distance d, what is its kinetic energy?

Two identical conducting spheres have charges +Q and -Q respectively. They are brought into contact and then separated. What is the final charge on each sphere?

A spherical shell of radius R carries a uniformly distributed charge Q. What is the electric field inside the shell at distance r from the center (r < R)?

A non-conducting infinite plane with uniform surface charge density σ produces an electric field. What is the magnitude of this field?

A charge +q is at position (0, 0) and charge -q is at (a, 0). At what point on the x-axis is the electric potential zero?

A conducting rod of length L is moving with velocity v perpendicular to a uniform magnetic field B. If the rod is in electrostatic equilibrium, what is the induced EMF?

For a point charge Q at the origin, if the electric potential at distance r is V(r), what is the electric field magnitude at that point?

A parallel plate capacitor is filled with a dielectric of dielectric constant κ. How does this affect the capacitance compared to vacuum?

A uniformly charged infinite line with linear charge density λ = 2 × 10⁻⁸ C/m is placed along the z-axis. A point charge q = +1 μC is located at a perpendicular distance r = 0.1 m from the line. The electric field due to the line charge at the location of the point charge is perpendicular to the line. If the permittivity of free space is ε₀ = 8.85 × 10⁻¹² F/m, calculate the magnitude of the electric field at the point charge location.

Two identical conducting spheres A and B have charges +Q and +3Q respectively. They are separated by a distance much larger than their radii. When brought into contact and then separated to the original distance, the electrostatic force between them changes by a factor of: