# When a mass is rotating in a plane about a fixed point its angular momentum is directed along. Option 1) The radius Option 2) The tangent to orbit Option 3) The line at an angle of 45° to the plane of rotation Option 4) The axis of rotation

As we learnt in

Centre of Mass of semicircular ring -

It lies at a distance of $\frac{2R}{\pi}$ from centre of the ring along its axis.

-

Along axis of rotation.

Option 1)

Incorrect

Option 2)

The tangent to orbit

Incorrect

Option 3)

The line at an angle of 45° to the plane of rotation

Incorrect

Option 4)

The axis of rotation

Correct

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