CAPE Physics Unit 2 · 2010 · Paper 1 · Question Q10

A flat circular coil with 150 turns has a radius of 4.0\text{ cm}. When a current of 3.0\text{ A} is passed through the coil, the magnetic field strength at the centre of the coil is

1. (A)0.56\text{ mT}
2. (B)7.07\text{ mT}
3. (C)56\text{ mT}
4. (D)707\text{ mT}