Question

What kind of electric charge is acquired:
(a) by a glass rod rubbed with silk cloth?
(b) by a plastic comb rubbed with dry hair?

Answer 1

a) positive charge

b) negative charge

Answer 2

(a) Charge acquired by a glass rod rubbed with silk cloth is positive charge.

(b) Charge acquired by a plastic comb rubbed with dry hair negative charge.

Explanation:

• An object is called uncharged object when there is equal number of electrical charges (neutral). An object is called charged object when there is polarity of charges in it.
• When two objects are rubbed with each other, there is frictional force acting between two objects which makes the object charged.
• The glass rod losses electrons to silk cloth. Thus, glass rode is positively charged and silk cloth is negatively charged.
• The dry hair losses electrons to plastic comb. Thus, plastic come is negatively charged and dry hair is positively charged.