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the emf is defined as the potential difference between two points [itex]\varphi(\vec{r_1})-\varphi(\vec{r_2})[/itex].
ok so lets say we make a trip round a closed circular wire with a battery to keep the current flowing then r1=r2 and so no emf has been done - is this true and if so why?
ok so lets say we make a trip round a closed circular wire with a battery to keep the current flowing then r1=r2 and so no emf has been done - is this true and if so why?