A thin insulated wire forms a plane spiral of N = 100 tight turns carrying a current I = 8 mA. The radii of inside and outside turns (Fig. 3.67) are equal to a = 50 mm and b = 100 mm. Find: (a) the magnetic induction at the centre of the spiral; (b) the magnetic moment of the spiral with a given current. |
New search. (Also 5349 free access solutions) |