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What does the minus sign in Lenz's law tell you?

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Electromagnetic induction occurs in conductors located in a magnetic field. Due to the change of flux, an electromotive force is induced to prevent the change of flux. The electromotive force is easiest to define using Faraday's law of magnetic induction, which states that the electromotive force is proportional to the change in magnetic flux over time and the constant of proportionality is the number of the loops. Faraday's law can be also written in the following way:

ε=NΔΦMΔt\begin{aligned} &\varepsilon=-N\cdot \frac{\Delta \Phi_M}{\Delta t} \end{aligned}

In the previous equation, the quantity NN represents the number of the loop, the relation ΔΦMΔt\dfrac{\Delta \Phi_M}{\Delta t} is describing the change in the flux of the magnetic field over time.

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