Question

The net electric charge of an amber rod which has been rubbed with fur is called negative

a. So that the proton charge will be positive

b. Because it charges repel

c. By arbitrary convention

d. Because amber is an insulator.

e. None of the above

- I figured the answer was A, can you explain what the answer is and why I am wrong?

Answer 1

As we all know all the material are made up of atoms. Different electronic configurations makes them different .when two surfaces which have losely packed electron are rubbed with each other than due to friction electron from one material goes to the other material. To which material it goes it made it negatively charged and from which the electron is coming it made that positively charged.

It totally depend upon the type of material that is been rubbed.

When you rub with fur ,amber becomes positively charged and fur negativity.

But when you rub glass with fur in that case glass becomes negatively charged and fur become positively charged.