Physics
When a comb is rubbed on dry hair, it gets charged. This is an example of :
- Gravitational force
- normal reaction force
- magnetic force
- electrostatic force
Answer
electrostatic force
Reason — When a comb is rubbed on dry hair, it gets charged. If this comb is brought near the small bits of paper, opposite charges are induced on the bits of paper and they begin to move towards the comb. The motion of paper bits is due to the electrostatic force of attraction exerted between the unlike charges on the comb and the paper bits.
Related Questions
The non-contact force is —
- force of reaction
- force due to gravity
- tension in string
- force of the friction
A ball placed on a table starts rolling down when the table is tilted. This is an example of :
- contact force
- non-contact force
- both (a) and (b)
- none of these
The nature of gravitational force is always:
- repulsive
- attractive
- depends on the bodies involved
- None of the above
The magnitude of a non-contact force between two bodies …………… with an increase in their separation and …………… with a decrease in their separation.
- increases, decreases
- decreases, increases
- increases, increases
- decreases, decreases