Question
Sat May 07, 2011 By:

# how we can recognize that both the charges have either +ve or -ve charge

Sat May 07, 2011

When we bring an alpha particle near the charge B and if the force of alpha particles on charge B is towards westwards and whereas the force on alpha particle by the charge B is eastwards then we can say that the charges have positively charge.

and when we bring the Beta particles towards a charge A charge and direction of force is same as we discuss above then we can say that both the charge are negatively charge.

When we bring together the two charges and if we see the attraction between them then we can say from coulomb's law that both the charges have different charges i.e. negatively charge and positively charge. And when we bring the two charges together and if we see repulsion between them then we can say from coulomb's law that both the charges have equal charge, i.e. may be positive charge or negative charge.

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# 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.

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