# Moving rod inside a coil

Discussion in 'Electronic Design' started by [email protected], Mar 19, 2008.

1. ### Guest

I have to mathematically model a metal rod moving inside a coil. When
I move the rod through the field, the emf is induced between the ends
of the rod causing current to flow. This will recharge a large
capacitor able to supply the necessary current to a resistive load.
Can somebody help me out to design the components of this system
(using formulas if possible) in order to recharge a capacitor of 47mF
with 3V? Any help is really appreciated.
Nick

2. ### Guest

Try these on for size:
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/farlaw.html#c1
http://hyperphysics.phy-astr.gsu.edu/hbase/emcon.html#emcon

Or crack open a decent Physics text.

Surely you mean a MAGNET moving inside a coil, instead of just "a
metal rod moving inside a coil"?

Michael

3. ### sycochknGuest

the voltage on a capacitor is.

1 farad * 1 amp * 1 second = 1 volt.
C * I * T = E

Bob

4. ### Robert BaerGuest

Rather unclear.
Is that rod magnetic?
How is that (magnetic?) field produced? Current thru the coil or
magnetized rod?
So thenyou say an emf is produced causing a current to flow; only
momentary and thus creating (a momentary) a voltage potential between
the rod ends - - but wait - - is ther something connected to them?
Cannot say the capacitor, as it is possible the magnetized rod
induced a current in the coil to charge the capacitor.
And where did that 3V come from?