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Answer: a
Explanation: First the average magnetic flux is calculated. Then the pole pitch is
calculated and then the length of the pole is calculated.
The formula for flux per pole, denoted typically when discussing electrical motors or generators within the context of electromagnetic mechanics, is given by:
[
Phi = frac{B cdot A}{P}
]
Where:
– (Phi) is the flux per pole (measured in Webers, Wb),
– (B) is the magnetic field strength or magnetic flux density (measured in Teslas, T),
– (A) is the cross-sectional area perpendicular to the magnetic flux (measured in square meters, m^2),
– (P) is the number of poles.
The formula indicates how the total magnetic flux is distributed across each pole within a motor or generator.