Electrostatics

Assertion : In the absence of an externally applied electric field, the displacement per unit volume of a polar dielectric material is always zero. Reason : In polar dielectrics, each molecule has a permanent dipole…

Assertion : Charge never flows from a condenser of higher capacity to the condenser of lower capacity. Reason : Flow of charge between two bodies connected by a thin wire is determined by the charges on them.

Assertion : All the charge in a conductor gets distributes on whole of its outer surface. Reason : In a dynamic system, charges try to keep their potential energy minimum.

Assertion : Net electric field insider conductor is zero. Reason : Total positive charge equals to total negative charge in a charged conductor.

A long solid non-conducting cylinder of radius $R$ is charged such that the volume charge density is proportional to $r$ where $r$ is the distance from axis. The electric field $E$ at a distance $r(r < R)$ will depend…

Assertion : If a dielectric is placed in external field then field inside dielectric will be less than applied field. Reason : Electric field will induce dipole moment opposite to field direction.

Assertion : Acceleration of charged particle in non-uniform electric field does not depend on velocity of charged particle. Reason : Charge is an invariant quantity. That is amount of charge on particle does not depend…

In a certain region of space, electric field is along the $z$-direction throughout. The magnitude of electric field is however not constant, but increases uniformly along the positive $z$-direction at the rate of $10^5…

A large solid sphere with uniformly distributed positive charge has a smooth narrow tunnel through its centre. A small particle with negative charge, initially at rest far from the sphere, approaches it along the line…

Assertion: Lines of force are perpendicular to conductor surface. Reason : Generally electric field is perpendicular to equipotential surface.

Two charged spheres separated by a distance ' $d$ ' exert some force on each other. If they are immersed in a liquid of dielectric constant 2 , then what is the force exerted, if all other conditions are same?

Three identical charges are placed at the vertices of an equilateral triangle. The force experienced by each charge, (if $k=1 / 4 \pi \varepsilon_0$) is