# The depletion voltage

1. Mar 22, 2016

### Hayool

The electric field
.........(1)

by saying that
.......(2)

I tried to integrate equation (1) from r2 to r1 but could not get equation(2).

Any suggesting.

Thanks

2. Mar 22, 2016

### TSny

Looks like you should be able to get (2) from (1) with just algebraic manipulation. Did you try letting $E = 0$ in (1) when $r = r_1$and then solving for $V$?

However, I get that (2) should have a positive sign for the last term.

Can you define the symbols $V_d$ and $V_o$ that occur in (1) and (2)?

3. Mar 23, 2016