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# Toroidal Solenoid

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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.

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This posting helps with a problem regarding toroidal solenoid. It helps calculate the coil's self-inductance, calculate the self induced emf in the coil, and determine the direction of induced emf. A step by step solution provided.

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A) Self inductance of a solenoid is given by : L = μ0N2A/L where N = Total number of turns = 550, A = Area of cross section = 6.7 cm2 = 6.7x10-4 m2, L = Length = 4.8 cm = 0.048 m. Substituting values, we get :

L = ...

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