Solenoid Magnetic Field Calculator
Calculate the magnetic field inside a solenoid.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Enter the number of turns per meter and the current in amperes. The calculator computes the magnetic field inside the solenoid in both tesla and gauss.
About Solenoid Magnetic Field
A solenoid produces a nearly uniform magnetic field inside its coil when current flows through it. The field strength equals mu_0 times n times I, where mu_0 is the permeability of free space, n is turns per length, and I is the current. Solenoids are used in electromagnets, relay switches, MRI machines, and inductors. The field inside is uniform and parallel to the axis, making solenoids ideal for laboratory and industrial applications.
Frequently Asked Questions
What is a solenoid?
A solenoid is a coil of wire wound in a helix. When current flows through it, a uniform magnetic field is produced inside the coil, similar to a bar magnet.
How does the field inside a solenoid compare to outside?
Inside an ideal solenoid, the field is strong and uniform. Outside, the field is much weaker and falls off rapidly. This makes solenoids useful for creating controlled magnetic fields.
What affects the solenoid field strength?
The field depends on the current and the number of turns per unit length. More turns or more current produce a stronger field. Inserting a ferromagnetic core greatly increases the field.