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Answer: a
Explanation: To obtain the value of flux per pole first the average magnetic field is obtained. Then the pole pitch and the length of the core is obtained to obtain the flux per pole.
The formula to calculate the flux per pole (Phi) in terms of electrical machines is given by:
[
Phi = frac{E times 60}{N_s times P times A}
]
Where:
– (Phi) is the magnetic flux per pole in Weber (Wb)
– (E) is the generated EMF (electromotive force) in volts (V)
– (60) is a conversion factor used to convert from revolutions per minute (rpm) to seconds
– (N_s) is the synchronous speed in revolutions per minute (rpm)
– (P) is the number of poles in the machine
– (A) is the number of parallel paths in the armature winding
This formula is especially relevant for electrical machines such as synchronous machines or generators, allowing for the calculation of the magnetic flux per pole based on the machine’s electrical and mechanical parameters.