Question:medium

A short bar magnet placed with its axis at \(45^\circ\) with an external field of \(400 \times 10^{-4}\,\text{T}\) experiences a torque of \(0.024\,\text{Nm}\). If a solenoid of cross-sectional area \(10^{-4}\,\text{m}^2\) and \(500\) turns replaces the short bar magnet such that they have the same magnetic moment, then the current flowing through the solenoid is:

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For a magnetic dipole in a uniform magnetic field, use \(\tau = MB\sin\theta\). For a solenoid, magnetic moment is \(M = NIA\).
Updated On: May 6, 2026
  • \(2\sqrt{2}\,\text{A}\)
  • \(5\sqrt{2}\,\text{A}\)
  • \(12\sqrt{2}\,\text{A}\)
  • \(4\sqrt{2}\,\text{A}\)
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The Correct Option is C

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