A closely wound solenoid of \(2000\) turns and area of cross-section as \(1.6\times10^{-4}\) m², carrying a current of \(4.0\) A, is suspended through its center allowing it to turn in a horizontal plane. The magnetic moment associated with the solenoid is:
1. \(0.18\) Am²
2. \(3.24\) Am²
3. \(1.28\) Am²
4. \(0.38\) Am²

A closely wound solenoid of \(800\) turns and area of cross-section \(2.5 \times10^{-4}\) m² carries a current of \(3.0\) A. If the solenoid acts like a bar magnet, then what is its associated magnetic moment?
1.\(0.6\) J/T
2.\(0.07\) J/T
3.\(0.3\) J/T
4.\(0.8\) J/T