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Find The Least Number Of Turns That The Winding Must Have

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Sandra Watson
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QUESTION :

An air-filled toroidal solenoid has a mean radius of 15.1cm and a cross-sectional area of 4.95cm2 (see the figure). The current flowing through it is 12.5A , and it is desired that the energy stored within the solenoid be at least 0.394J . What is the least number of turns that the winding must have? Express your answer numerically, as a whole number, to three significant figures.

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