Inductor Doubt: Instantaneous EMF=Back EMF?

[sahil_time]

Doubt on Inductor!pleasez help

Imagine an AC source and a pure inductor...if the Instantaneous EMF=Back EMF due to changing Magnetic field in Inductor then how does the current flow?

 

[berkeman]

Imagine an AC source and a pure inductor...if the Instantaneous EMF=Back EMF due to changing Magnetic field in Inductor then how does the current flow?

What is the equation for the relationship between current and voltage for an inductor?

 

[sahil_time]

I meant that if the back emf = applied voltage always then the net PD=0..so how can the current flow?