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F= q*v*B = mv^2/r so dat solving you get r = mv/(q)(B)

Hence as B varies r varies as well.kk if that is the case then if v is constant even while B varies, then how do we conserve angular momentum. Yh the case is made that a magnetic field always acts perpendicular to the velocity. This means angular momentum is not conserved since r is varying and m and v are constant. Angular momentum = mvr. Ok if we decide to conserve angular momentum then v has to vary. if v varies then how did v vary since magnetic forces act perpendicular to v. Now the funny thing is that i derived a formula for magnetic force dependent solely on r. I ensured that momentum was conserved in this derivation. I also made the assumption that the magnetic force is conservative so it is path independent. The funny thing is that when integrated this new formed formula with r i got exactly the change in kinetic energy expected if angular momentum was conserved. So people my question is this what is happening:

is angular momentum conserved or not?

if not how does a particle change kinetic energy since magnetic field can do no work becos it always acts perpendicularly to the velocity. People this baffles me a lot. I would appreciate your answers