Question

A plastic comb is rubbed with dry hair whereas a glass rod is rubbed with a piece of silk cloth. Which of these will get negatively charged?
A) Plastic comb
B) Glass rod
C) Dry hair
D) Silk cloth
A. A and B
B. B and C
C. A and D
D. B and D

Answer 1

Answer:

c) glass rod will get negatively charged i guess

Answer 2

The negatively charged are C. A) plastic comb and D) silk cloth.

Explanation:

• All matter have equal number of negative and positive charges which makes a matter neutral.
• When energy is applied to the matter, there is difference in the number of charges in it which makes a matter positively or negatively charged.
• Here, when the plastic comb and dry hair and when glass rod and silk cloth are rubbed, electrostatic charges are involved with energy from friction.
• The dry hair and glass rod losses electrons to plastic comb and silk cloth respectively.
• Thus, plastic comb and silk cloth are negatively charged and dry hair and glass rod are positively charged.