# Electric Stress between wires of a solenoid

1. Jul 1, 2007

### walkinginwater

hi, guys:
I am reading some notes of Electromagnetism. It claims that for a helix solenoid with N turns of wire, the distance between the successive coil is $$\Delta a$$, the total vertical length of the solenoid is d. The artical claims that if we apply a voltage $$v$$ to this solenoid, there will be electric stress between successive coils.
The amplitude of the electric stress is $$\frac{V}{d} \Delta a$$.

2. Jul 3, 2007

### mgb_phys

I haven't heard the term electrical stress but two current carrying wires will generate a force between them - this is the definition of the Ampere.
I imagine that the stress must be taken into account when designing a large solenoid / transformer - have you tried the engineering forum.

3. Jul 18, 2007

### xez

They just mean electric stress = voltage.
Think of the solenoid as a ruler with the windings being
ticks on the scale.

If you put one voltage at one end of the coil, and another
voltage on the other end of the coil, then clearly there's
delta_V between the top and bottom of the helix.

Since there are N turns and delta_V of total
voltage difference along the length of those N turns,
there is a voltage difference or 'electric stress' (in
poorly chosen confusing language) of delta_V/N
between one turn and the next, so all the steps on the

4. Jul 18, 2007

### mgb_phys

Thanks Xez, the equations didn't show up in my browser so it wasn't clear what the OP was talking about.

5. Jul 19, 2007

### walkinginwater

This Thread Has been Solved! Thanks for Meir Achuz

Thanks very much, xez!!