Home
Class 12
PHYSICS
The ratio of the forces between two char...

The ratio of the forces between two charges placed at a certain distance apart in air at half of the distance apart in medium of dielectric .k. is

A

`1:K`

B

`K:1`

C

`1:K^(2)`

D

`K^(2):1`

Text Solution

Verified by Experts

The correct Answer is:
B
Let two small spheres having a constant charge q place d in air at a distance r, then the force acting between them is given by
`F_("air") =(1)/(4pi epsilon_(0)) *(q^(2))/(r^(2))`
When both changes placed in a medium of dielectric constant K, then
`F_("medium") = (1)/(4pi epsilon_(0)K) * (q^(2))/(r^(2))`
`:. (F_("air"))/(F_("medium"))=(K)/(I)`
Promotional Banner

Similar Questions

Explore conceptually related problems

What is the smallest electric force between two charges placed at a distance of 1.0m ?

What is the force between two small charged of 2 xx 10^(-7) C placed 30 cm apart in air?

Is there any lower limit to the electric force between two particles placed at a certain distance?

Draw two parallel lines at a distance 5 cm apart.

The force between two point electric charges kept at a distance d apart in air is F. If these charges are kept at the sme distance in water, the force between the charges is F'. The ratio F'//F is equal to ……….. .

The force between two charges separated by a distance 1m is 1.8N. The charges are in the ratio 1: 2 then the charges are

Two point charges placed at a distance r in air experience a certain force. Then the distance at which they will experience the same force in a medium of dielectric constant K is

Two charges exert a force of 10 N on each other when separated by a distance 0.2 m in air. When they are placed in another medium of dielectric constant K = 4 , and separated by distance R. they exert same force. The distance R equats to

The two metallic plates of radius r are placed at a distance d apart and its capacity is C . If a plate of radius r//2 and thickness d of dielectric constant 6 is placed between the plates of the condenser, then its capacity will be

Two identical balls having like charges and placed at a certain distance apart repel each other with a certain force. They are brought in contact and then moved apart to a distance equal to half their initial separation. The force of repulsion between them increases 4.5 times in comparision with the initial value. The ratio of the initial charges of the balls is