# How to differentiate magnetic flux to find emf?Watch

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#1
The answer of Φ=BA is 0.03 Wb but I need to find the EMF value so e=-dΦ/dt. But if I differentiate it then it becomes 0? That seems wrong. I can't do the question any other way because I don't have enough data, I only have the values of R,v,l &B.
0
4 years ago
#2
(Original post by Airess3)
The answer of Φ=BA is 0.03 Wb but I need to find the EMF value so e=-dΦ/dt. But if I differentiate it then it becomes 0? That seems wrong. I can't do the question any other way because I don't have enough data, I only have the values of R,v,l &B.
0
4 years ago
#3
(Original post by Airess3)
The answer of Φ=BA is 0.03 Wb but I need to find the EMF value so e=-dΦ/dt. But if I differentiate it then it becomes 0? That seems wrong. I can't do the question any other way because I don't have enough data, I only have the values of R,v,l &B.

You only ever post snippets.
0
4 years ago
#4
You need to find an equation for how the magnetic flux changes over time. If it doesn't change, by definition there can't be any induced EMF.
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#5
Error.
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#6
(Original post by uberteknik)

You only ever post snippets.
I've just posted it .
0
#7
(Original post by Stonebridge)
I've posted it.
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