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`        the effective radius of circle is r and no. of turns is n.the current in it is i ampere .the work done in rotating coil by 180degree in an external field B will be`
4 months ago

Arun
23372 Points
```							The effective radius of a circular coil is R and number of turns is N. The current through it is i ampere. The work done is rotating the coil from angle 0° to 180° in an external magnetic field B will be -solution : first of all, find magnetic moment of circular coil. magnetic moment, M = ANIwhere A is area of circular coil, i.e., A = πR².N is number of turns and I is current through wire. so, magnetic moment, M = πR²Ni given, magnetic field intensity is B we know, workdone is rotating a coil from α to β in external magnetic field B is given by, W = MB(cosα - cosβ) given, α = 0° and β = 180° so, workdone , W = πR²NiB(cos0° - cos180°)= πR²NiB(1 + 1) = 2πR²NiB
```
4 months ago
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### Course Features

• 731 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions