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 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: