Electrostatics ...

A solid metallic sphere has a charge + 3Q. Concentric with this sphere is a conducting spherical shell having charge –Q. The radius of the sphere is a and that of the spherical shell is b (b > a). What is the electric field at a distance R (a < R < b) from the centre?

Which of the following plots represents the variation of the electric field with distance from the centre of a uniformly charged non-conducting sphere of radius R?

Three infinitely long charge sheets are placed as shown in figure. The electric field at point P is

A charged ball B hangs from a silk thread S, which makes an angle θ with a large charged conducting sheet P, as shown in the figure. The surface charge density σ of the sheet is proportional to

Three concentric metallic spherical shells of radii R, 2R ,3R are given charges Q₁ , Q₂ , Q₃ respectively. It is found that the surface charge densities on the outer surfaces of the shells are equal. Then, the ratio of the charges given to the shells, Q₁ : Q₂ : Q₃ is

A sample of HCl gas is placed in an electric field of 3 × 10⁴ NC ^-1. The dipole moment of each HCl molecule is 6 x 10^-30 Cm. The maximum torque, that can act on a molecule is

Which of the following statement(s) is/are correct?

A long, hollow conducting cylinder is kept coaxially inside another long, hollow conducting cylinder of larger radius. Both the cylinders are initially electrically neutral.

A hollow cylinder has a charge q coulomb within it. If ϕ is the electric flux in unit of voltmeter associated with the curved surface B, the flux linked with the plane surface A in unit of voltmeter will be

The electric flux for Gaussian surface A that enclose the charged particles in free space is (given, q₁ = –14 nC, q₂ = 78.85 nC, q₃ = – 56 nC)