Question
Mon September 26, 2011 By: Smit Modi

# here's a m.c.q plz choose the correct option &explain the same:-a planet is moving in an elliptical orbit.if T,V,E &L stands for its kinetic energy,gravitation potential energy,total energy, total energy &angular momentun about the centre of earth,then: (A)T is conserved (B)V is always positive (C)E is always negative. (D)magnitude of L is conserved,but its direction changes continuously.

Tue September 27, 2011
(b) V is always positive

Gravitational potential energy is negative which is an indicative of bound state.
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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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