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

Answer: Option C

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.