phy114 lab9

# phy114 lab9 - Faraday's Law of Induction Objective The...

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Faraday’s Law of Induction Objective: The objective of this lab is to examine the relationship between a magnetic field and the induced voltage, emf, it creates that is characterized by Faraday’s Law of Induction. Faraday’s law states that a changing magnetic field can generate electromotive force, or voltage in the form of an induced emf, where V=-N( ∆Φ / t), so that N is the number of turns in the solenoid, ∆Φ is change in magnetic flux, and t is the change in time. The magnetic flux, Φ , is equal to the magnetic force multiplied by the cross sectional area of the coil, so either a change in magnetic force or area can create a change in magnetic flux. The magnetic force, B, is equal to uIN/L, or the constant of proportionality multiplied by the current and number of turns in coil all divided by the length of the solenoid. Based on these equations, some assumption can be made. The magnetic field, B can be calculated if the magnitude of the current is known. The magnetic field should be the same on the edges and at the center of the solenoid. The induced emf can be calculated if the change in magnetic field is known, and as the frequency of the current increases, the induced emf should increase as well. Finally, increasing the numbers of turns in the coil, N, and the magnitude of the magnetic field B, will both cause an increase in the induced emf. If Faraday’s law is true, the calculated values for the induced

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phy114 lab9 - Faraday's Law of Induction Objective The...

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