A planet is moving in an elliptic orbit. If T, V, E, L stand respectively for its kinetic energy, gravitational potential energy, total energy and magnitude of angular momentum about the center of force, which of the following statements is correct
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In a circular or elliptical orbital motion torque is always acting parallel to displacement or
velocity. So, angular momentum is conserved. In attractive field, potential energy is negative. Kinetic energy changes as velocity increase when distance is less. But if the motion is in a plane, the direction of 
does not change.
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