The electrostaic potential of a charged body represents the degree of electrification of the body. It detemines the direction of flow of charge between two charged bodies placed in contact with eachother. Charege always flows a body at higher potential to another body at lower potential. The flow of charge stops as soon as the potentials of the two bodies become equal.
Electrostatic potential in electrically corresponds to level in case fo liquids , pressure in case of gases and temperature in case of heat.
Due to a point charge q in air, electrostatic potentials at a distance r from the charge is `V = (q)/(4pi in_(0) r)` The SI unit of potential is volt.
Read the above passage and answer the follwing questions :
(i) The capacity of a body A is 100 times the capacity of body B and charge on A is 10 times the charge on B. When A and B are put in contact with eachother, will charge flow from A to B to A ? Why ?
(ii) Calcualte the potential in air at a point 1 meter away from charge of `1muC`.
(iii) What values of life do yo+-earn from the concept of electric potential ?

Explanation

(i) `V_(A) = (q_(A))/(C_(A)) and V_(B) = (q_(B))/(C_(B)) :. (V_(B))/(V_(A)) = (q_(B))/(C_(B)) xx (C_(A))/(q_(A)) = (C_(A))/(C_(B)) xx (C_(A))/(q_(A)) = 100xx (1)/(10) = 10`
`V_(B) gt V_(A)`
`:.` Charge would flow from B to A, as potential of B is greater than potential of A.
(ii) From `V = (q)/(4pi in_(0) r) = ((10^(-6))xx9xx10^(9))/(1) = 9xx10^(3)` volt.
(iii) The concept of potential emphasises taht charges flows from a body at higher potential to a body at lower potential . In day to day life, knowledge flows from a person of higher learning level to the the person of lower learning level. If we happen to have some health problem, we must always seek the opinion of a super specialist in the field concerned. The knowledge and information the super specialist have is of much higher level. The line of treatment adopted by him is going to cure us. The quacks who might have more knowledge of a variety of other fields shall be of no use.