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A wooden disc of mass M and radius R has...

A wooden disc of mass M and radius R has a single loop of wire wound on its circumference. It is mounted on a massless rod of length d. The ends of the rod are supported at its ends so that the rod is horizontal and disc is vertical. A uniform magnetic field `B_(0)` exists in vertically upward direction. When a current I is given to the wire one end of the rod leaves the support. Find least value of I.

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The correct Answer is:
`I=(Mgd)/(2piR^(2)B_(0))`
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