Can anyone help me with this problem?
I have calculated the answer but I am not confident that it is correct.
"Calculate emf generated in a current-carrying coil of 500 turns and cross-sectional area 5cm2 when a flux density of 0.2T density in it is reversed (changed to the opposite polarity) in a time of 10ms."
My understand is as follows.
If Flux Density = Flux/Area Then Flux = Area * Flux Density
Therefore .2T = Flux/5cm2 Then Flux = (.0005m2) * .2T which is .0001wb
so Intial Flux = .0001wb
Then flux density is changed to opposite polarity, am I right in thinking 0.2T becomes -0.2T?
If so then Flux Density = Flux/Area Then Flux = Area * Flux Density
So -.2 = Flux/5cm2 Then Flux = (.0005m2) * -.2 which is -.0001wb
Then Final Flux = -.0001wb
Then using lenz law
-500(-.0001 -.0001)/.01
-500 (-.0002)/.01
= .1/.01
= 10V
10V seems to high to me......
Any help would be greatly appreciated,
Kone
I have calculated the answer but I am not confident that it is correct.
"Calculate emf generated in a current-carrying coil of 500 turns and cross-sectional area 5cm2 when a flux density of 0.2T density in it is reversed (changed to the opposite polarity) in a time of 10ms."
My understand is as follows.
If Flux Density = Flux/Area Then Flux = Area * Flux Density
Therefore .2T = Flux/5cm2 Then Flux = (.0005m2) * .2T which is .0001wb
so Intial Flux = .0001wb
Then flux density is changed to opposite polarity, am I right in thinking 0.2T becomes -0.2T?
If so then Flux Density = Flux/Area Then Flux = Area * Flux Density
So -.2 = Flux/5cm2 Then Flux = (.0005m2) * -.2 which is -.0001wb
Then Final Flux = -.0001wb
Then using lenz law
-500(-.0001 -.0001)/.01
-500 (-.0002)/.01
= .1/.01
= 10V
10V seems to high to me......
Any help would be greatly appreciated,
Kone