A particle carrying charge +q is placed at the center of a thick-walled conducting shell that has inner radius R and outer radius 2R and carries charge −2q. A thin-walled conducting shell of radius 5R carries charge +2q and is concentric with the thick-walled shell. Define V = 0 at infinity. Calculate all distances from the particle at which the electrostatic potential is zero.

10R/11 and 5R/2

Explanation:

The radius of the conducting shell = R,

Electrostatic potential inside the shell (r<R) = kq/R

Electrostatic potential outside the shell (r>R) = kq/r

If x is the point of zero potential

Electrostatic potential for inner shell,

Electrostatic potential for outer shell,

Electrostatic potential for the thin walled shell,

The values of X=r that satisfy the above equation are 10R/11 and 5R/2

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force