Physics - Magnetism Question with Solution | TestHub

The magnetic induction inside an ideal solenoid is given by $B={\mu }_{0}nI$, where $n$ is the number of turns per unit length and $I$ is the current.

Since $n=\frac{N}{L}$, where $N$ is the total number of turns and $L$ is the length of the solenoid, we have $B=\frac{{\mu }_{0}NI}{L}$.

Thus, the magnetic induction depends on the total number of turns, the length of the solenoid, and the current carried by the wire.

It is independent of the radius of the wire.

Answer: radius of the wire.