Question
Sun June 26, 2011

# why A.C current attract and D.C current repel

Mon June 27, 2011
Alternating current (AC) varies between positive peak value to negative peak value in a fixed time interval. For time when it is in positive region, it attracts and when it is in negative region it repels.

While in DC there is no variation in its magnitude and polaity. Therefore it only attracts and DC of high magnitude can be vergy dangerous.
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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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