Question

The magnetic energy stored per unit volume in a solenoid with 1000 turns per metre carrying a current of 0.7 A is:

• A. \(0.154\;J\,m^{-3}\)
• B. \(0.616\;J\,m^{-3}\)
• C. \(0.308\;J\,m^{-3}\)
• D. \(0.924\;J\,m^{-3}\)

Hint:

For a solenoid, \[ u=\frac12\mu_0n^2I^2. \] This formula directly gives magnetic energy stored per unit volume.

Answer 1

The Correct Option is C