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Gravitational Force

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How to calculate force of electrostatic when there two mediums other than air

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Q. Given the following data, calculate the electrostatic force and gravitational force between two electrons. Show that the electrostatic force is much greater than the gravitational force for the electrons separated by a certain distance.
Charge on the electron

= 1.6 \times 10^{- 19} C

Mass of the electron

= 9.1 \times 10^{- 31} k g

Gravitational constant

= 6.67 \times 10^{- 11} N m^{2} k g^{- 2}

Q. Two identical condncting spheres, fixed in space, attract each other with an electrostatic force of 0.108 N when separated by 50.0 cm, center-to-center. A thin conducting wire then connects the spheres, When the wire is removed, the spheres repel each other with an electrostatic force of 0.0360 N. What were the initial charges on the spheres?

Q. Two point charges

q_{1}

q_{2}

are placed at a distance of

50 m

from each other in air, interact with a certain electrostatic force. If the medium is replaced with oil whose relative permittivity is

5

, then the interaction force between them is still the same. Now the separation between them is

Q. Why electrostatic force constant 'k' depends on medium?

Q. The electrostatic force between two subatomic particles is than/as the gravitational force between them.

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