JEE Physics - MCQ Practice Questions

An electric dipole of dipole moment p is placed in a uniform electric field E at an angle θ to the field. What is the torque acting on the dipole?

A uniformly charged conducting sphere of radius R and total charge Q is surrounded by a concentric spherical shell. Using Gauss's law, what is the electric field at a distance r > R from the center?

The electric potential energy of a system of two point charges q₁ and q₂ separated by distance r is:

A conducting sphere of radius a is charged to potential V₀. What is the surface charge density on the sphere?

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)?

An electric field E = 100 V/m is applied between two parallel plates separated by distance d = 0.02 m. What is the potential difference between the plates?

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?

Three point charges are arranged at the vertices of an equilateral triangle of side a. If charges are +q, +q, and -2q, what is the net electric potential at the centroid?

A charge Q is uniformly distributed on a ring of radius R. What is the electric potential at a point on the axis at distance x from the center?

Consider a uniformly charged disc of radius R with total charge Q. What is the electric field at the center of the disc?

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

Two point charges q₁ = 2 μC and q₂ = -2 μC are separated by 1 cm. What is the magnitude of electric field at the midpoint between them?

A spherical conductor of radius R is grounded and placed near an isolated point charge +Q at distance d from its center (d > R). Which statement is correct about the induced charge on the sphere?

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: