Question
Download Solution PDFA bar magnet of magnetic moment M is placed in a magnetic field (B) at an angle of θ with the field. Find the work done in rotating the bar magnet by 180°.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
- Magnetic moment: It is defined as the product of pole strength and the distance between the poles of a magnet.
⇒ M = m × 2l
where M = magnetic moment, m = pole strength and 2l = distance between the poles
- Work done in rotating a magnet of magnetic moment M with angle θ in an external magnetic field B is given as:
⇒ W = MB (1 - cosθ)
EXPLANATION:
Since angle rotated (θ) = 180°
Work done (W) = MB (1 - cosθ) = MB (1 - cos180°) = MB (1 -(-1)) = 2 MB
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