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{ 82. A metal rod of resistance }R is fixed along a diameter of }}{ a conducting ring of radius }r . There is a magnetic field }}{ of induction }B perpendicular to the plane of the ring. }}{ The ring is spinning with an angular velocity }ω about }} its axis. The centre of the ring is joined to its rim by } an external wire. The ring and the wire have negligible } resistance. The current in the wire is |
| Answer» { 82. A metal rod of resistance }R is fixed along a diameter of }}{ a conducting ring of radius }r . There is a magnetic field }}{ of induction }B perpendicular to the plane of the ring. }}{ The ring is spinning with an angular velocity }ω about }} its axis. The centre of the ring is joined to its rim by } an external wire. The ring and the wire have negligible } resistance. The current in the wire is | |