JEE Physics - MCQ Practice Questions

A parallel plate capacitor is filled partially with dielectric (dielectric constant K, thickness d/2) and partially with air (thickness d/2). Its capacitance is:

An electron enters a uniform electric field of strength E with initial velocity perpendicular to the field. Its trajectory is:

A conducting plane carries uniform surface charge density σ. The electric field just outside the surface is:

A point charge Q is placed at the center of a cubic Gaussian surface of side a. The electric flux through one face is:

An electric dipole (moment p) is placed in a non-uniform electric field. It experiences:

The electric field at distance r from an infinitely long uniformly charged line with linear charge density λ is:

A capacitor is charged to potential V and then isolated. If the separation between plates is doubled, what happens to the potential difference?

A charge distribution creates potential V(r) = kr² where k is constant. What is the electric field at distance r?

Two parallel conducting plates have surface charge density σ and -σ respectively. What is the electric field in the region between the plates?

Two point charges q₁ and q₂ are separated by distance r. If they are moved to distance 2r apart, how does the interaction energy change?

A charged particle of mass m and charge q is projected perpendicular to a uniform electric field E. What is the trajectory?

Three capacitors of capacitance 2 μF, 3 μF, and 6 μF are connected in series across a 12 V supply. What is the charge on the 2 μF capacitor?

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)?

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?