Solenoid Magnetic Field Calculator

Find the magnetic field inside a solenoid.

Number of turns

Length

Current (A)

Magnetic field (T) 0.0063

Formula: B = μ₀·(N/l)·I

Step-by-step with your numbers:

1. Values used:

2. Number of turns = 500

3. Length = 20

4. Current = 2 A

6. Magnetic field = 0.0063T

Did we solve your problem today?

A solenoid produces a nearly uniform magnetic field along its axis.

The math behind it

B = μ₀·n·I, where n = N/l is turns per metre. A core multiplies B by its relative permeability.

500 turns over 20 cm at 2 A → about 6.3 mT.

Where is the field strongest?

Inside the solenoid it is uniform; outside it is weak.