# Homework Help: Electric Potential Difference

1. Jul 22, 2015

### LXX

1. The problem statement, all variables and given/known data
If 3000V is applied to the teltron tube with EHT voltage, what would be the potential difference between the parallel plates in the teltron tube?

2. Relevant equations

3. The attempt at a solution
Since one end of the plate is positive, the other end is negative, 3000V-(-3000V)=6000V

2. Jul 22, 2015

### Staff: Mentor

I don't know a teltron tube, but in general if you supply a device with 3000v then the cables carry a potential difference of 3000v. If there are two cables, one will be 3000v more than the other. For devices which need balanced + and - voltages this fact is usually made abundantly clear, e.g., requires ±3000v, and it will need 3 power cables with one of them being ground (i.e., 0v) to which the other potentials are referenced.

3. Jul 22, 2015

### Bystander

You'll need to sketch the experimental set-up; we've no way of knowing which plates you're discussing.

4. Jul 22, 2015

### LXX

Below is the experiment set up. Thank you

#### Attached Files:

• ###### DSC00153.JPG
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5. Jul 24, 2015

### lightgrav

The electron beam travels thru the gap between parallel plates, supplied by the
(Tel-Atomic?) PS on the left. Bottom plate connection appears to be red (+) socket.
Not clear what color socket Top plate is connected to ... below the meter, left side ... it SHOULD be labeled.
if it is black, then (almost guarantee) it is ground (0).

(Peculiar to use a deflection voltage that high, but the plates ARE far apart ...)