A solenoid has 2500 turns/m, a diameter of 10cm, and a length of 20cm. If the current varies from 0 to 10A, how much energy is stored in the magnetic field of the solenoid?
N 2500 * 0.2 turns Length 0.2 m r (0.1 / 2) m i 10 A uo 4 * pi * 10 ^ -7 A pi r ^ 2 L uo N^ 2 A / Length L 0.012337 H Energy ∫ Li di [0,i] Energy (1 / 2) L i ^ 2 0.616849 J
the fee and direction of the present and the form of the conductor and interior of sight conductors make certain how means is saved . A without delay cable donning a contemporary generates a magnetics field around it and generates an electrostatic field with the earth, working example.
No of turns2500x20/100500turns Flux 500x current/reluctance Reluctance length/(areax4pix10^ -7) 0.2/(4pi^2x(0.1/2)^2)2x10^7. InductanceN^2/(2x10^7)0.0125 henries Energy storedIntegeral(Ldi/dtXi)xdt(0.0125)x1 watts
