- #1
darksyesider
- 63
- 0
In the formula: ## emf = -\dfrac{d\phi}{dt}##, ##\phi = \int B\cdot dA##.
Does the area mean only the part of the region which has a magnetic field (if it's constant)?
for example, if you have a loop around a toroid, and want to calculate the induced emf, would ##\phi = B(\pi radiusoftoroid)^2 ## or ##\phi = B (\pi radiusofregion)^2## ?
I personally believe the former, but cannot verify this.
Does the area mean only the part of the region which has a magnetic field (if it's constant)?
for example, if you have a loop around a toroid, and want to calculate the induced emf, would ##\phi = B(\pi radiusoftoroid)^2 ## or ##\phi = B (\pi radiusofregion)^2## ?
I personally believe the former, but cannot verify this.