JEE Physics - MCQ Practice Questions
Physics is where JEE ranks are usually won or lost, since a single conceptual slip changes the whole answer. Questions here span mechanics, rotational motion, thermodynamics, waves and oscillations, electrostatics, current electricity, magnetism, optics, and modern physics. Numerical problems carry full derivations so you can see which step you skipped, not just which option was right.
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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?