Why is the air gap between stator and rotor should be kept as small as mechanically possible in induction motor?

Why is the air gap between stator and rotor should be kept as small as mechanically possible in induction motor? Correct Answer both, to reduce leakage flux between stator and rotor, and also for better operating power factor

The leakage flux and power factor depend on the air gap and it should be as small as possible.
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