Embibe Experts Solutions for Chapter: Electric Charges and Fields, Exercise 1: Gujarat Board-2018

An electric dipole is placed in a uniform electric field. The resultant force on it is _______.

Write Coulomb's law and represent the forces between the two charges in vector form.

Define polar and non-polar molecules. Explain the behaviour of non-polar molecules in a uniform magnetic field.

The liquid drop of mass 'm' has a charge 'q'. What should be the magnitude of electric field E to balance this drop?

The number of electric field lines emerged out from $1 \mathrm{mC}$ charge is ______. $\left({\epsilon }_{\circ }=8.85\times {10}^{-12}\mathrm{MKS}\right)$

Two metallic spheres of radii $R_1$ and $R_2$ are charged. Now they are brought into contact with each other with a conducting wire and then are separated if the electric fields on their surfaces are $E_1$ and $E_2$ respectively, $\frac{E_1}{E_2}=$______.
 

Define surface charge density and volume charge density of an electric charge. Also, state its unit.

A charge $Q$ is uniformly distributed on the circumference of a circular ring of radius $a$. Find the intensity of the electric field at a point at a distance $x$ from the centre of the axis of the ring.