Question

# A conical pendulum consists of a simple pendulum moving in a horizontal circle as shown in the figure.  C is the pivot, O the center of the circle in which the pendulum bob moves and  the constant angular velocity of the bob.  If →L is the angular momentum about point C, then Only magnitude of →L is constantBoth magnitude and direction of →L​ changes→L is constant Only direction of →L is constant

Solution

## The correct option is A Only magnitude of →L is constantThe direction of →L  is perpendicular to the line joining the bob to point C.  Since this line keeps changing its orientation in space, direction of →L keeps changing however as ω is constant, magnitude of →L remains constant.

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