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Answer: a
Explanation: The designer’s problem is to provide a path of low reluctance to that of
comparatively little flux leaks away. In order to compensate for the flux leakage, high
mmf is maintained.
The relation between reluctance (R), magnetic flux (Φ), and magnetomotive force (MMF, denoted as F) in a magnetic circuit is described by the formula:
[
text{MMF} = text{Reluctance} times text{Flux}
]
This can be expressed mathematically as:
[
F = R cdot Phi
]
Where:
– MMF (F) is measured in ampere-turns (At).
– Reluctance (R) is measured in ampere-turns per weber (At/Wb).
– Magnetic Flux (Φ) is measured in webers (Wb).
Thus, to rearrange the formula, we get:
[
Phi = frac{F}{R}
]
This equation indicates that the magnetic flux is directly proportional to the magnetomotive force and inversely proportional to the reluctance. In summary, an increase in MMF will result in an increase in magnetic flux, while an increase in reluctance will result in a decrease in magnetic flux, assuming all other factors remain constant.