Electric Charges & Fields — Previous-Year Questions
12 curated PYQs across 11 topics, drawn from JEE Mains, JEE Advanced, NEET UG, and CUET papers. Every question has a worked-out explanation.
Coulomb's Law
Drag two charges and watch the inverse-square force update live, with proper LaTeX formula.
Q1. Two point charges +Q and −Q are separated by r. The force between them is F. If r is doubled, the new force is:
JEE 2022Q2. Force between two charges in vacuum is F. In a medium of εᵣ = 4, the force becomes:
JEE 2020Superposition of Forces
Drag a test charge among 4 fixed charges — net force = vector sum of individual forces.
Q1. Three equal charges +q sit at corners of an equilateral triangle. Force on a charge equals:
JEE 2019Field Lines — Single Charge
Radial outward (+) or inward (−) lines with animated dots showing field direction.
Q1. Electric field lines never:
JEE 2018Field Lines — Dipole
Streamlines from + to −. Adjustable separation. Animated dots travel along lines.
Q1. Ratio E_axial : E_equatorial at same r for a short dipole is:
JEE 2021Q1. On the axis of a charged ring at z=R/√2, the field is:
JEE 2020Q1. The electric field of an infinite line charge varies with r as:
JEE 2019Q1. A dipole of moment p in uniform E. Torque is maximum when θ equals:
JEE 2017Gauss's Law
Drag a charge in/out of a Gaussian sphere. Φ = Q_enc/ε₀ regardless of position inside.
Q1. A point charge q is placed at center of a cube. Flux through one face is:
JEE 2020Gaussian Surface — Sphere
E = 0 inside a uniformly charged shell, kQ/r² outside. Plot with live cursor.
Q1. Inside a uniformly charged spherical shell, electric field is:
JEE 2019Q1. Excess charge on an isolated conductor in electrostatic equilibrium resides:
JEE 2018Charge on Connected Spheres
Same potential ⇒ Q ∝ R, σ ∝ 1/R. Smaller sphere has higher field.
Q1. Two spheres of radii R and 2R are connected by a wire. Ratio of surface charge densities σ_R : σ_2R is:
JEE 2022Electric Charges & Fields previous-year questions on sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs). Free physics practice for Class 12, JEE Mains, JEE Advanced, NEET UG, AP Physics, SAT, and CUET-UG candidates.