Question
Tue February 07, 2012 By: Michelle

# What are the similarities and dissimilarities between gravitational force and electrostatic force?

Tue February 07, 2012
Gravitational force is the force generated between two masses, such as the Earth and the Moon, an apple and the Earth, or anything else possessing mass in the universe. As a matter of fact, Mars is exerting a gravitational force on you - it extends forever. The formula for gravitational force is: Fgrav. = (Gm1m2)/(d2) where G is the gravitational constant 6.67 x 10-11 m1 is one mass in kilograms, m2 is the other mass d is the separation distance in meters between the two masses. Electrostatic forces: Electrostatic force exists between two charged objects. Unlike gravitational force, electrostatic force can be either a force of ATTRACTION or one of REPULSION, depending on the nature of the two charges; like charges repel, opposites attract. But this force also extends forever and its formula is surprisingly similar to the gravity formula: Felectrostatic = (Cq1q2)/(d2) where C is Coulomb's constant 8.99 x 10-9 q1 is one charged object in coulombs of charge, q2 is the other. d is the separation distance in meters. But question is , whether the two objects in question will attract or repel. For instance, a proton has a charge of +1.60 x 10-19 C. An electron has a charge of -1.60 x 10-19 C. They are opposite, so they will attract. The electrostatic force per unit Q2 exceeds the gravitational force per unit M2 by a factor of almost 1040.
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Thu August 10, 2017

# Why does the charge inside the closed surface of a gaussian surface contribute to electric flux. Why doesnt it pass through as in the case of electric flux due to a charge that is situated outside? Ans: When we find electric flux through a surface, then we consider the charge enclosed by the surface. This is done because Gauss' law is defined in terms of charge enclosed. So, a charge that is situated inside the surface contributes to the flux.   Thank you for a quick response. However, the answer provided by you doesnt clarify my doubt. There was a clear reasoning provided in the video lesson, why charge outside does not contribute to the flux. The electric field lines produced by a charge situated outside pass through the gaussian surface. Therefore, the question iam asking is that, what happens in the case of charge situated inside.

Tue August 08, 2017

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