In a region of space a radial magnetic field is established

Last updated: 6/10/2023

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 3 r2 Here 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 Ans 42a4 B v R x a 3