Home › UP Board Class 12 › Physics › Electromagnetism › A circular coil of N turns and radius R carries …
A circular coil of N turns and radius R carries current I. Its magnetic dipole moment is
AπIR²
BNIR
CNIπR²
DN²IπR
Answer & Solution
Correct answer: C. NIπR²
1. Magnetic moment for a single loop is m = IA, where A is the loop area.
2. For a circular loop of radius R, A = πR².
3. With N turns, the moment scales linearly: m = NIA.
4. Combining: m = NIπR².
_Source: NCERT Class 12 Physics Ch 4 "Moving Charges and Magnetism", §4.10.2_
Related questions
Certain galvanometers use eddy currents to provide electromagnetic:The SI unit of inductance is the:Eddy current flow patterns are said to resemble swirling eddies in:Foucault lived from 1819 until:Who discovered eddy currents?Swirling induced currents in a metal plate are called:What in Faraday's equation represents Lenz's law?Lenz's law says the induced current opposes the change in: