A thin circular disc of radius R is uniformly charged with density σ > 0 per unit area…
Physics · JEE Main · NTA Exams — Magnetic Effects of Current and Magnetism
A thin circular disc of radius R is uniformly charged with density σ > 0 per unit area. The disc rotates about its axis with a uniform angular speed ω. The magnetic moment of the disc is :
- 2πR4σω
- πR4σω
- \(\frac{\pi \mathrm{R}^{4}}{2} \sigma \omega\)
- \(\frac{\pi \mathrm{R}^{4}}{4} \sigma \omega\)
Answer
(D) R ^ 4 4
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