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suddenly the minus pops up formula

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i know the formula for flux and inductance

but when i learned circuit theory
i always had these formulas
for inductor
and for capacitor
for inductor

there where no minus in the inductance formula

why in physics they add minus


New Member
Because it was connected with a certain convention for tracing around a loop. As you go around a loop you have rules for calculating the voltage across an element based on the direction you pass through relative to the assumed current flow. There can be various conventions for doing this. You must use a consistent set of rules.
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