A disc of radius `R` is pivoted at its rim. The period for small oscillations about an axis perpendicular to the plane of disc is

A uniform disc of radius R is pivoted at point O on its circumstances. The time period of small oscillations about an axis passing through O and perpendicular to plane of disc will be

A uniform disc of radius R is pivoted at point O on its circumstances. The time period of small oscillations about an axis passing through O and perpendicular to plane of disc will be

In a Faraday disc dynamo, a metal disc of radius R rotates with an angular velocity about an axis perpendicular to the plane of the disc and passing through its centre.The disc is placed in a magnetic field B acting perpendicular to the plane of the disc.Determine the induced emf between the rim and the axis of the disc.

From a circular disc of radius R and mass 9 M , a small disc of radius R/3 is removed from the disc. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through O is