Assignment:
A toroidal solenoid has 550 turns, cross- sectional area 6.7 square cm, and a mean radius of 4.8 cm.
A) Calculate the coil's self-inductance.
B) If the current decreases uniformly from 5A to 2A in 3ms, calculate the self induced emf in the coil.
C) 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? Explain.
Provide complete and step by step solution for the question, use formulas.