Question

The magnetic field $\vec{B}$ in a circular coil does not depend on:

• A. current
• B. radius
• C. number of turns
• D. area

Answer 1

Answer: (D)

The magnetic field at the centre of circular coil
$B=\frac{{\mu }_{0}nI}{2r}$
where $r=$ radius of coil
$I=$ current flowing in the coil.
$n=$ number of turns in a coil
Therefore, magnetic field in a circular coil does not depend on area of coil.