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## Main Question or Discussion Point

I understand that magnetic flux density is measured in Teslas or Weber’s per square meter and that voltage or emf is measured using faraday’s law of induction which is

E= - N dφ/dt

Where

N= number parallel fields

Φ = magnetic flux (Wb)

E= emf (V)

What I don’t understand is the time function of the formula. If we rearranged the formula to make flux the subject what would the time function represent? Correct me if I’m wrong but If there is constant voltage and current through a coil then there is a constant magnetic field inside the coil (or through the core if there is one).

In this situation, what does the time variable represent?

E= - N dφ/dt

Where

N= number parallel fields

Φ = magnetic flux (Wb)

E= emf (V)

What I don’t understand is the time function of the formula. If we rearranged the formula to make flux the subject what would the time function represent? Correct me if I’m wrong but If there is constant voltage and current through a coil then there is a constant magnetic field inside the coil (or through the core if there is one).

In this situation, what does the time variable represent?