Suppose that a rectangular toroid has 2000 windings and a self-inductance of 0.040 H. If h = 0.10 m, what is the current flowing through a rectangular toroid when the energy in its magnetic field is 2.0×10−6J?

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Chapter1: Units, Trigonometry. And Vectors
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Suppose that a rectangular toroid has 2000 windings and a self-inductance of 0.040 H. If h = 0.10 m, what is the current flowing through a rectangular toroid when the energy in its magnetic field is 2.0×10−6J? 

Use the formula L = NΦm/I = (µ0N2h/2π)ln(R2/R1) NOT the formula U = LI2/2

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