Question for electromagnetic induction

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The discussion focuses on calculating the induced electromotive force (emf) in a conducting rod rotated in a magnetic field. The rod, 1 meter long, rotates at an angular frequency of 400 rad/s, with one end in contact with a circular metallic ring and a magnetic field of 0.5 T present. The magnetic flux can be expressed as Flux = A(B)cos(wt), where A is the area and B is the magnetic field strength. The time derivative of the magnetic flux is suggested as a method to find the induced voltage. The conversation emphasizes the relationship between rotation, magnetic flux, and induced emf.
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a conducting rod of length 1 m is rotated with an angular frequency of 400/s about an axis normal to the rod passing through one of its ends .the other end of the rod is in contact with a circular metallic ring. a constant magnetc field of 0.5T parallel to the axis exists in the region.find the emf induced between the ends of the rod.
 
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I think you might be able to take the time derivative of magnetic flux which is voltage.
So it will be , Flux= A(B)cos(wt)
where A is the Area B is the field strength
and w is the angular frequency.
 
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