A 2 m long metallic rod rotates with an angular frequency `200" rod "s^(-1)` about on axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallic ring. A constant megnetic field of 0.5 T parallel to axis exises everywhere. The emf developed between the centre and the ring isA. 100VB. 200VC. 300VD. 400V

A 2 m long metallic rod rotates with an angular frequency `200" rod "s

1.	A 2 m long metallic rod rotates with an angular frequency `200" rod "s^(-1)` about on axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallic ring. A constant megnetic field of 0.5 T parallel to axis exises everywhere. The emf developed between the centre and the ring isA. 100VB. 200VC. 300VD. 400V
Answer» Correct Answer - B The emf developed between the centre and the rings is `epsi=(1)/(2)Bl^(2)omega=(0.5xx2^(2)xx200)/(2)=200V`

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