Question

An inflated rubber balloon is rubbed with a woollen cloth whereas a ballpoint pen refill is rubbed with a polythene bag. Which of these will get positively charged?
A) Inflated rubber balloon
B) Woollen cloth
C) Ballpoint pen refill
D) Polythene bag
A. A and B
B. B and C
C. A and D
D. B and D

Answer 1

B. B) Woollen cloth and C) Ballpoint pen refill will get positively charged.

Explanation:

• When two material undergo friction, the particles that form the material become charged.
• When inflated rubber balloon is rubbed with a woollen cloth, the woollen cloth losses electrons to rubber balloon. This makes woollen cloth positively charged and rubber balloon negatively charged.
• When pen refill is rubbed with a polythene bag, the electrons move from ballpoint to polythene bag. This makes ballpoint positively charged and polythene bag negatively charged.

Answer 2

The right answer is b. woolen cloth and ballpoint pen refill