A solenoid is of length 0.5 m. The solenoid carries 2 A current. What is the magnetic moment of the solenoid? [Take, n = 20 per cm and r = 0.01 m]

Explanation

Here, Length of solenoid, `l = 0.5 m`
Current in solenold, `I = 2 A`
Nmber of turns `n = 20` per cm = 200 per m Magnetic moment of solenoid is
`M = (n) xx (l) xx (i) xx ( pi r ^(2))`
`= 2000 xx 0. 5 xx 2 xx pi xx (0.01 ) ^(2)`
`= 0. 628 A -m ^(2)`