Question

Calcualte the coil's self-inductance.

A toroidal solenoid has 570 turns, cross-sectional area 6.80cm , and mean radius 5.00cm^2 .

1. Calcualte the coil's self-inductance.

2.If the current decreases uniformly from 5.00A to 2.00A in 3.00ms , calculate the self-induced emf in the coil.

3. The current is directed from terminal a of the coil to terminal b. Is the direction of the induced emf from a to b or from b to a?

It is one of my mastering physics HW. and i can't figure out this one.
There is no hint and.. idk what to do …

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