PF EMI BYU 5

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In a region of space, a radial magnetic field is established, flux density B of which varies with distance r from the origin of a coordinate system according to the law B =b/r^2. Here b is a positive constant. A small conducting ring of radius a and resistance R is placed parallel to the y-z plane with its centre at point (x,0,0). Find the force that must be applied on the ring to move it with a constant velocity vi^.


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