# Quick Question ABOUT SLIP RINGS?

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#1
In AC generator, when coil is vertical, why isnt currnt induced?
0
2 years ago
#2
(Original post by A.shaquile)
In AC generator, when coil is vertical, why isnt currnt induced?
When the coil is vertical or perpendicular to the magnetic field, the flux through the coil is maximum. So the rate of change of flux is zero which means that induced emf is zero and the induced current is also zero.
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#3
Sorry, I'm not sure what flux means.
0
2 years ago
#4
A simple answer to your question is 'wire, magnet and motion all have to be at 90 degrees to get a current induced' (Fleming's right hand rule).
Flux sort - of means magnetic field lines cutting through the coil.
Eimmanuel's answer is the standard answer for A level and I guess you're doing GCSE.
1
2 years ago
#5
(Original post by A.shaquile)
Sorry, I'm not sure what flux means.
You can think magnetic flux as the number of magnetic field lines that pass through a cross-sectional area.
http://hyperphysics.phy-astr.gsu.edu...ic/fluxmg.html

Instead of thinking in terms of magnetic flux, we can consider the cutting of magnetic field by the coil.
As the coil moves through the vertical position, no cutting occurs, so the induced emf is zero.
1
2 years ago
#6
(Original post by old_teach)
...
Maybe yes, may be no.
In GCSE or GCE or IGCSE physics, the students that I taught would encounter such answer.
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