The good power factor of an induction motor can be achieved if the average flux density in the air gap is

Power factor in an induction motor is influenced by the flux density in the air gap.

A good power factor can be achieved when the average flux density in the air gap is large.

This is because a larger flux density reduces the magnetizing current required, leading to a higher power factor.

If the flux density is too small, more magnetizing current is needed, which lowers the power factor.