Question

Find B - field at the centre of a spiral of N - Turns carrying a current i and having inner and outer radii a and b respectively.

• A. $\frac{{\mu }_{0}Ni}{2(b-a)}$
• B. $\frac{{\mu }_{0}Ni}{b-a}$
• C. $\frac{{\mu }_{0}Ni}{2(b-a)}ln\left(\frac{b}{a}\right)$
• D. $\frac{{\mu }_{0}Ni}{2b}$

Answer 1

Answer: (C)