Answer to Question #205335 in Electricity and Magnetism for Musawer Hussain

Question

If a metal sphere A having positively charged is brought into contact with an uncharged 

metal sphere. As a result:

(a) both spheres are positively charged (b) A is positively charged and B is neutral

(c) A is positively charged and B is negatively charged (d) A is neutral and B is 

positively charged

Answer 1

When two metal (metal is a conductor, so there are free electrons in both spheres) spheres are brought into contact, some amount of the charge will flow from the sphere A onto sphere B, because positive charges on A want to repel from each other and move, so both spheres are charged positively. However, the charge on A will be smaller than the initial. So the right answer is (a).