Question

Magnetic field at point P inside solenoid of n turns per unit length and current i is

• A. ${\mu }_{0}ni$
• B. $\frac{{\mu }_{0}ni}{2}$
• C. $\frac{{\mu }_{0}ni}{\sqrt{2}}$
• D. $\sqrt{2}{\mu }_{0}ni$

Answer 1

The correct option is C $\frac{{\mu }_{0}ni}{\sqrt{2}}$


$B=\frac{{\mu }_{0}ni}{2}[sin\alpha +sin\beta ]$ here $\alpha =\beta ={45}^{\circ }$
$\therefore B=\frac{{\mu }_{0}ni}{2}\sqrt{2}$