⇒ If they are brought in contact and are seperated , the two sphere will have equal amounts of electric charge Q/2 after seperation.
⇒ It can be said that the charge is established on the other sphere which is equal to Q/2.
⇒ There is another method of charging any substance.
⇒ Suppose the net electric charge on the sphere is zero.
⇒ A plastic rod rubbed against fur is brought close to the sphere.
⇒ The free electrons on the sphere , as result of repulsion go to the part of the sphere away from the rod.
⇒ Consequently the part of the sphere closer to the rod becomes positively charged.
⇒ Now when the sphere is connected to the earth through conducting rod, the electrons on the sphere are conducted to the earth.
⇒ Still the sphere retains the positive charge even if the connection with the earth is removed.
⇒ When the plastic rod is moved away from the sphere, the electrons get redistributed on the sphere such that the same positive charge is spread all over the surface of the sphere.
In this way a body can be charged without bringing in physical contact with another charged substance. This phenomenon is called Induction of electric charge.
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