Coulomb's Laws
Coulomb's Laws: Overview
This topic covers concepts, such as, Electrostatic Force between Two Charges in Vacuum, Coulomb's Law, Visualizing a Point Charge & Dimensions of Permittivity etc.
Important Questions on Coulomb's Laws
Two protons move parallel to each other, keeping distance r between them, both moving with same velocity . Then the ratio of the electric and magnetic force of interaction between them is

Two fixed point charges units are separated by a distance ‘a’. Where should the third point charge be placed for it to be in equilibrium?

How does the coulomb force between two point charges depend upon the dielectric constant of the intervening medium?

A charge is placed at the centre of the line joining two equal charges . If the system of charges be in equilibrium, then find minimum value of charge from the given options. (charge of an electron)

The centres of two identical small conducting spheres are apart. They carry charges of opposite kind and attract each other with a force . When they are connected by a conducting thin wire they repel each other with a force What is the ratio of the magnitude of charges carried by the spheres initially?

A charge is placed at each of the two opposite corners of a square. A charge is placed at each of the other two corners. If the resultant force on is zero, then

Electric charges of and are placed in air at the corners and respectively of an equilateral triangle having length of each side The resultant force on the charge at is







A quantity X is given by ε0L . where ε0 is the permittivity of free space, L is length, ΔV is potential difference and Δt is time interval. The dimensional formula for X is the same as that of


What is the Formula for Relative Permittivity?

What are the dimensions of electrical permittivity?

Two identical conducting spheres with negligible volume have and charges, respectively. They are brought into contact and then separated by a distance of The electrostatic force acting between the spheres is Given : SI unit

Two small spheres each of mass are suspended from a point by threads long. They are equally charged and repel each other to a distance of Then charge on each of the sphere is The value of will be __________ .

A charge is situated at a distance '' away from both the sides of a grounded conducting '' shaped sheet as shown in the figure.
The force acting on the charge is
