# What is the potential difference between points a and b?

• max1205
In summary, the conversation discusses a problem involving six identical capacitors connected in a certain configuration and the calculation of potential difference between points a and b. The conversation includes equations and attempts at a solution, with the final answer being 0 V. The speaker also mentions having only one attempt left in a physics mastering program.
max1205

## Homework Statement

Six identical capacitors with capacitance C are connected as shown in figure 30.68 (attachment). What is the potential difference between points a and b?

C=Q/V

## The Attempt at a Solution

The Cequivalent = 3/2 C

Therefore, Q = CV
= (3/2C)(12)
= 18 C

since capacitors in parallel have the same potential difference, the two capacitors that are in parallel between point a and b have the potential difference,

V = Q/C
= 18C/(C)
= 18

Thus, the two capacitors between point a and b, have a combined potential difference of 36V.

Is this correct?

#### Attachments

• figure 30.68.jpg
9.4 KB · Views: 745
any ideas?

i don't know, i agree with most of what your saying, but haven't done any calculations yet.
when i read 'potential difference' the first thing that i think of is subtraction.
since both capacitors have the same potential, then the difference of their potentials is zero.
but i could be wrong... and probably am.
i only have one attempt remaining in mastering physics so i don't want to test this theory until someone else does.

i was right,

got it, thanks!

## 1. What is potential difference?

Potential difference, also known as voltage, is the difference in electric potential energy between two points in an electrical circuit.

## 2. How is potential difference measured?

Potential difference is measured in volts (V) using a voltmeter.

## 3. What causes potential difference?

Potential difference is caused by the separation of positive and negative charges. This can occur through a variety of means, such as chemical reactions, friction, or electromagnetic induction.

## 4. How does potential difference affect current flow?

Potential difference is directly related to current flow through Ohm's law (V=IR). This means that a higher potential difference will result in a higher current flow.

## 5. Can potential difference be negative?

Yes, potential difference can be negative if the direction of current flow is opposite to the direction of the electric field. This is known as a reverse bias in a circuit.

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