The discussion centers on the behavior of inductance and electromotive force (emf) in a coil of wire as current increases. It is established that inductance (L) is a physical quantity that remains constant for an air core inductor, regardless of the current. The equations L = (N * F_b) / I and emf = -L * (dI/dt) illustrate that while current increases linearly, the magnetic flux (F_b) also increases, counterbalancing the current's effect on inductance. Therefore, the emf remains constant despite changes in current.
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Your answer looks correct to me. The EMF is constant since the increase in I is linear. The inductance is a physical quantity, not affected by current (for an air core inductor). If the inductor had a ferrite or iron core, would that change your answer?alexdr5398 said:
If the current increases, would anything else on the right side of the above equation change?alexdr5398 said:
berkeman said:Your answer looks correct to me. The EMF is constant since the increase in I is linear. The inductance is a physical quantity, not affected by current (for an air core inductor). If the inductor had a ferrite or iron core, would that change your answer?
TSny said:
Yes. If the current doubles, then the flux doubles. So, the formula would leave L unchanged.alexdr5398 said:
Yes. The inductance is determined by the physical properties of the inductor (size, shape, number of wraps, type of core, etc.) as berkeman pointed out.