AIPMT-PRELIMS Physics Electric Charges and Fields Class 12 Questions

An electric dipole of moment ‘p’ is placed in an electric field of intensity ‘E’. The dipole acquires a position such that the axis of the dipole makes an angle θ with the direction of the field. Assuming that the potential energy of the dipole to be zero when θ = 90°, the torque and the potential energy of the dipole will respectively be

What is the flux through a cube of side ‘a’ if a point charge of q is at one of its corner?

A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will

Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, the number of electrons missing from each ion will be (e being the charge on an electron)

A square of side L meter, as shown in the figure, is placed in a uniform electric field E (volt/m) acting along the same plane at an angle θ with the horizontal side of the square as shown in figure. The electric flux linked to the surface, in units of volt-m, is

The electric potential at a point in free space due to a charge Q coulomb is Q × 10¹¹ volts. The electric field at that point is -

Three point charges +q, –q and +q are placed at points (x = 0, y = a, z = 0), (x = 0, y = 0, z = 0) and (x = a, y = 0, z = 0) respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are

An electric dipole of moment p is lying along a uniform electric field. The work done in rotating the dipole by 90° is:

A square surface of side L m is in the plane of the paper. A uniform electric field also in the plane of the paper, is limited only to the lower half of the square surface, (see figure). The electric flux in SI units associated with the surface is :

The unit of permittivity of free space ε₀ is :-

An electric dipole has the magnitude of its charge as q and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, the force on it and its potential energy are respectively :-

A charge q is located at the centre of a cube. The electric flux through any face is -

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The coulomb force $\vec{F}$ between the two is -(where $\text{K} = \frac{1}{4\pi\varepsilon_0}$)

Identical charges (-q) are placed at each corner of a cube of side 'b' then electrical potential energy of charge (+q) which is placed at centre of cube will be

A charge Q μC is placed at the centre of cube, the flux coming out from any surfaces will be:

Electric field at centre O of semicircle of radius 'a' having linear charge density λ given is given by

A charge Q is situated at the corner of a cube, the electric flux passed through all the six faces of the cube is :