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A planet is moving in an elliptical orbi...

A planet is moving in an elliptical orbit around the sun. If T,U,E and L stand for its kinetic energy gravitational potential energy, total energy and magnitude of angular momentum about the centre of force, which of the following is correct ?

A

T is conserved

B

U is always positive

C

E is always negative

D

L is conserved but the direction of vector `vec(L)` will continuously change

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The correct Answer is:
C
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