Force exerted by magnetic field
When none of the magnetic field bypasses any sections of the core (no flux leakage), the force exerted by an electromagnet on the core material is:
The 1.6 T limit on the field mentioned above sets a limit on the maximum force per unit core area, or pressure, an iron-core electromagnet can exert; roughly:
Given a core geometry, the B field needed for a given force can be calculated from (2); if it comes out to much more than 1.6 T, a larger core must be used.
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