KCET2010PhysicsMagnetic Effects of Current
Magnetic field at the centre of a circular coil of radius R due to i flowing through it is B . The magnetic field at a point along the axis at distance R from the centre is
Options
- AB 2
- BB 4
- CB 8
- D8 ~B
Correct answer
C. B 8
Step-by-step solution
The magnetic field at a point along the axis at distance R from the centre of a circular coil of radius R carrying current i is aligned B _ A &= ₀ 2 R ² 4 ( R ²+ R ² )^ 3 / 2 &= ₀ i 2 8 R &= B 8 [ ~B _ centre = B = ₀ i 2 R ] aligned