<^< Electromagnets | Course Index | Examples: Magnetism >^>
The strength of a magnetic field (H) is proportional to the applied current (I) multiplied by the number of turns (N), and inversely proportional to the mean length of the magnetic circuit (L). The magnetic field strength is thus given by:
H = (N x I) / L
where H is the magnetic field strength (in A/m), N is the number of turns in the coil (no units), I is the current (in A), and L is the mean length of the magnetic circuit (in m).
Magnetic flux density (B) is given by the ratio of flux (Φ) to area A. Thus:
B = Φ/A
where B is the magnetic flux density (in Tesla), Φ is the flux (in Weber) and A is the area of the field (in m2).
<^< Electromagnets | Course index | Examples: Magnetism >^>
