Solve H= (NI)/ (2(Pi)r): Calculate Current, Voltage

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SUMMARY

The discussion focuses on solving the equation H = (NI)/(2(π)r) in the context of electrical circuits, specifically addressing the calculation of current and voltage. Participants clarify that 'H' refers to the H-field in a toroidal inductor setup, not magnetic field strength. The correct approach involves applying Kirchhoff's Voltage Law (KVL) and considering the inductor's behavior, leading to a differential equation that describes the current over time. The initial conditions are crucial for solving this equation accurately.

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Homework Statement


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Homework Equations



H= (NI)/ (2(Pi)r)
V=IR

The Attempt at a Solution



a)

total resitance = 100ohms?
from this would the current be 0.12A

over 1ohm resistor: 0.12V

not sure if this is correct even. Any help would be much appreciated.
 

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I think you misread 'H' here. H in the question doesn't refer to the magnetic field strength and the formula you provided here refers to the H-field in a torus.

Also in your answer you disregarded the inductor. Bear in mind that once you open the circuit, you can't treat the inductor as a short-circuited wire. What you should do is to write out the KVL loop equation, bearing in mind the potential drop across the inductor is L(di/dt), where i is the time-varying current through the inductor. Then you'll get a differential equation which you then have to solve for the current. Plugging in a initial value will help you find the unknown constant of integration.
 

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