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 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?
A hollow conducting sphere of radius R has total charge Q. What is the surface charge density?
A parallel plate capacitor with plate area A and separation d is filled with dielectric constant κ. What is the capacitance?
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 uniformly charged infinite line with linear charge density λ creates an electric field at perpendicular distance r. What is E?
A point charge +q is placed at the origin. What is the electric potential at a distance r from the charge?
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?