Que no 2 and 3 …...................................................................…......…... ... .. ..…..

2 . use direct formula of radius of curvature
R=(1+y’^2)^1.5/y’’
3) loop will lift from table when normal reaction is zero.ie magnetic force= weight of body. so here it will become magnetic force pi*r*I*net magnetic field magnitude .net magnetic field is just vector summation of all components of field