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# A conical pendulum consists of a simple pendulum moving in a horizontal circle as shown. C is the pivot. O is the centre of the circle in which the pendulum bob moves and w the constant angular velocity of the bob. If $\overrightarrow {L}$ is the angular momentum about C, then

$(A)\;\overrightarrow L \: is \: constant \\ (B)\;Only \: direction \: of \: \overrightarrow L \: is\: constant \\ (C)\;Only \: magnitude \: of \: \overrightarrow L \:is \: constant\\ (D)\;none \: of \: the \: above$

$\bar L= \bar r \times \bar p$ is radially outward, its direction keeps changing, but magnitude remains constant.
edited Mar 25, 2014