A planet is moving in an elliptical orbit around the sun. If $T, V, E$ and $L$ stand respectively 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 planet is moving in an elliptical orbit around the sun. If $T, V, E$ and $L$ stand respectively 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 ?
- [AIPMT 1990]
- A
$T$ is conserved
- B
$V$ is always positive
- C
$L$ is conserved but direction of vector $L$ changes continuously
- D
$E$ is always negative
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