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Figure 1   A 200 turn coil is wrapped around a ferromagnetic core.


Table 1 contains voltage and current readings for the inductor in Figure 1.

Phys 223 University Physics III
Lab 6     Faraday's Law

Lab 6 Exercise

The 60 Hz sinusoidal voltages contained in Table 1 were applied to the inductor shown in Figure 1.

Recall for an inductor,

(1)

If,

then,
(2)

The ratio of the voltage amplitude to the current amplitude is,
(3)
where the inductance, L is,
(4)
where is the permeability of the core material, N is the number of turns, A is the cross-sectional area of the core, and l is the length of the flux path.
  1. Plot the voltage as a function of current.

  2. Given that the frequency is 60 Hz, calculate the inductance for each current and voltage pair.

  3. Why does the inductance decrease at higher currents?