An air-filled toroidal solenoid has a mean radius of 14.5 cm and a cross-sectional area of 5.05cm^(2) as shown in (Figure 1).
Picture this as the toroidal core around which the windings are wrapped to form the toroidal solenoid. The current flowing
through it is 11.7 A , and it is desired that the energy stored within the solenoid be at least 0.385 J .
Figure
Part A
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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turns
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