# Magnetic Field From a Solenoid - Biot-Savart Law

1. Jan 2, 2012

### fonz

I'm fairly confident I can express the strength of a magnetic field along the axis of a current carrying loop at some distance x away using the Biot-Savart Law. I'm just trying to extend this idea for a solenoid with N turns. I'm assuming that the current would become NI in this case?

Regards
Dan

Last edited: Jan 2, 2012
2. Jan 2, 2012

### Antiphon

Only if the coils lay atop one another.

The proper way is to integrate I along the helical path of the solenoid winding.

3. Jan 2, 2012

Thanks