A planet is moving around the earth in elliptical orbit as shown in figure. If angular momentum of the planet about the centre of Sun is represented by L, then

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$L_{A} = L_{B} = L_{C} = L_{D}$

$L_{A} = L_{C} = L_{D} > L_{B}$

$L_{A} > L_{C} = L_{D} > L_{B}$

$L_{A} < L_{C} = L_{D} < L_{B}$

answer is C.

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Detailed Solution

Gravitational force of attraction of sun on the planet passes through the centre of sun; so this force does not produce any moment about the centre of sun. Hence angular momentum about the centre of sun remains conserved.

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