Q: A particle of mass m moves in the XY plane with a velocity v along the straight line AB. If the angular momentum of the particle with respect to origin O is L_{A} when it is at A and L_{B} when it is at B, then

(a) L_{A} > L_{B}

(b) L_{A} = L_{B}

(c) The relationship between L_{A} and L_{B} depends upon the slope of the line AB

(d) L_{A} < L_{B}

Ans: (b)

Sol: The magnitude of the angular momentum of a particle about a fixed point is equal to the product of its linear momentum and the length of the perpendicular to the linear momentum from the fixed point O.