JEE Physics - MCQ Practice Questions

A uniformly charged infinite plane sheet has surface charge density σ. What is the electric field at a distance d from the sheet?

Two point charges +8μC and -2μC are separated by 3 m. The electric potential is zero at a point on the line joining them, located at distance x from the +8μC charge. Find x:

A charged rod of length L with linear charge density λ is placed along the x-axis. The electric field at a point on the perpendicular bisector at distance y from the center is:

A parallel plate capacitor with plate separation d and area A is charged to voltage V. A dielectric of dielectric constant K is inserted between the plates. The change in stored energy is:

Two conducting spheres of radii r₁ and r₂ (r₁ > r₂) have charges Q₁ and Q₂. They are connected by a wire. The final charge distribution will be such that:

The electric field on the axis of a uniformly charged ring of radius a and total charge Q at distance x from the center is:

A point charge q is enclosed by a closed surface. If the surface is deformed without changing the charge enclosed, the electric flux through the surface:

An electron is projected horizontally with velocity v into a uniform electric field E pointing downward. Its trajectory is:

A uniformly charged sphere of radius R and total charge Q has its charge density reduced by half. The electric potential at the surface becomes:

Two identical metal spheres with charges +Q and -3Q are brought into contact and then separated by distance r. The electrostatic force between them is:

An electric dipole experiences maximum torque when placed in a uniform electric field at angle θ with respect to the field. The value of θ is:

The electric field intensity at distance r from a line charge with linear charge density λ is given by:

A parallel plate capacitor has capacitance C and is charged to voltage V. If voltage is doubled and a dielectric K is inserted, the energy stored becomes:

A test charge q is moved from point A to point B in an electric field. The work done by the field is 100 J. If the same charge is moved from B to A, the work done is:

A uniformly charged infinite plane sheet has surface charge density σ. What is the electric field at a distance from the sheet?

A metallic sphere of radius R is charged such that surface charge density is σ. If the sphere is surrounded by a dielectric medium of dielectric constant K, how does the electric field just outside the surface change?

Two fixed point charges Q₁ = +2μC and Q₂ = -2μC are separated by 2 m. A test charge +1μC is moved along the perpendicular bisector. At what distance from the midpoint (on the bisector) is the electric field maximum?

A parallel plate capacitor is filled with two dielectrics of thickness d/2 each and dielectric constants K₁ and K₂. What is the equivalent capacitance if the original capacitance (empty) was C₀?

An electric dipole with dipole moment p is placed in a non-uniform electric field. Which statement is correct?

A hollow conducting sphere of radius R carries charge Q. A point charge q is placed at the center. What is the electric field at distance r from center (r > R)?