If current of 4 A produces magnetic flux of 3 10⁻³ ~Wb through a coil of 400 turns, the energy stored in the coil will be

Step-by-step solution

array ll & Given I =4 ~A , ~N =400 and & =3 10⁻³ ~Wb & E = LdI dt and e = Nd dt & Nd dt = LdI dt & N = LI & L = N I = 400 3 10⁻³ 4 =0.3 H & Energy stored in the coil = 1 2 LI ^2 = & 1 2 0.3 16 = & 2.4 ~J array