A closely wound solenoid of 800 turns and area of cross section $2.5 \times 10^{-4} \;m^2$ carries a current of $3.0 \;A$Explain the same in which the solenoid acts like a bar magnet . What is its associate magnetic moment ?

Question

$\begin{array}{1 1} 6\;J/T \\ 60\;J/T \\ 0.6\;J/T \\ 0.06\;J/T \end{array} $