Magnetic Field Solenoid

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Field inside long ideal solenoid (n turns per length, current I) is:

RankGuru · Accepted Answer

A solenoid is a long coil consisting of many turns. For an infinitely long (ideal) solenoid:
- The magnetic field outside is zero.
- The magnetic field inside is **uniform** and directed along the axis.
$B = \mu_0 n I$
where $n$ is the number of turns per unit length ($n = N/L$) and $I$ is the current.

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Magnetic Field Solenoid

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