A bob of mass, $m$ attached to an inextensible string of length, $l$ , is suspended from a vertical support. The bob rotates in a horizontal circle with an angular speed, $ω r a d / s$ about the vertical. About the point of suspension:

angular momentum changes in direction but not in magnitude

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angular momentum changes both in direction and magnitude

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angular momentum is conserved

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angular momentum changes in magnitude but not in direction

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Solution

The correct option is B angular momentum changes in direction but not in magnitude
$¯ L$ changes in direction not in magnitude
magnitude of L = $m ω / l$ upwards , which remains the same

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A bob of mass, m attached to an inextensible string of length, l, is suspended from a vertical support. The bob rotates in a horizontal circle with an angular speed, ω rad/s about the vertical. About the point of suspension:

The correct option is B angular momentum changes in direction but not in magnitude¯L changes in direction not in magnitudemagnitude of L = mω/l upwards , which remains the same

A bob of mass, $m$ attached to an inextensible string of length, $l$ , is suspended from a vertical support. The bob rotates in a horizontal circle with an angular speed, $ω r a d / s$ about the vertical. About the point of suspension:

The correct option is B angular momentum changes in direction but not in magnitude
$¯ L$ changes in direction not in magnitude
magnitude of L = $m ω / l$ upwards , which remains the same