Teaching MPPSC Assistant Professor Mock Test Series 2025 Physics Moving Charges and Magnetism Magnetic Field on the Axis of a Circular Current Loop
A coil having 100 turns is wound tightly in the form of a spiral with inner and outer radii 1 cm and 2 cm respectively. When a current 1 A passes through the coil, the magnetic field at the centre of the coil is
1
2π ln(2) mT
2
\(\frac{\pi}{2} \ln (2) \mathrm{mT}\)
3
π ln(2) mT
4
\(\sqrt{2} \pi \ln (2) \mathrm{mT}\)