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Lets say we have two spheres of different charges why when we connect them by a single copper wire they gain the same potential

Thanks in advance

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- #1

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Lets say we have two spheres of different charges why when we connect them by a single copper wire they gain the same potential

Thanks in advance

- #2

tiny-tim

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hi nishantve1!

tell us what*you* think, and then we'll comment!

tell us what

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I am new to Electrostatics , first of all I have no idea but still what I am able to figure out is maybe the charges on both become equal but I see thats not much to do with the potential or is it am I right ?

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tiny-tim

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ok, well, always start with theI am new to Electrostatics …

(btw, that is why the pf homework template requires you to write out the equations first,

DEFINITION:

what is electric potential?

what does it do?

what does it do?

EQUATIONS:

what equations do you know for electric potential?

- #5

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Sorry , next time I will definitely post in homework sub forum

Electric potential I know is Work done per charge in bringing it from infinity to a point .

Electric potential is Like gravitational potential it The closer a test charge is to a electric field source more potential energy it has and thus more Electric potential .

Electrons flow from higher to lower potential thats what makes electricity flow

V(a) - V(b) = integral from a to b E.dl

E = -dV/dr

V = E.d

Due to a point charge at a distance R the electric potential is Q/4 pi Epsilno0 R

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tiny-tim

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mmm … that's only if the potentialElectric potential I know is Work done per charge in bringing it from infinity to a point .

better is to talk about potential

electric potential difference

= potential energy difference per charge

= minus work done, per charge, by the electric field

= potential energy difference per charge

= minus work done, per charge, by the electric field

i always get confused about this , but isn't that forElectrons flow from higher to lower potential …

ok , now call the potentials V and W, and apply the above to how an individual charge will move, and how that will affect the potential differenceWhy when two charged conductors connected by a conducting wire gain the same potential .

Lets say we have two spheres of different charges why when we connect them by a single copper wire they gain the same potential

- #7

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oh yeah electrons flow form lower to higher potential .if both the bodies have charge of same polarity say Positive then electrons from one with lower potential say W will flow to one with higher potential V . now what ? the electrons will go and neutralize the positive charge on the other one . And if there polarities were to be different then electrons will flow the same way as above . I am seriously not able to figure out please Help me !

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tiny-tim

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the information you haven't yet used is that there's only a fixed amount of total charge

(i assume the spheres are isolated, ie not connected to any voltage source)

so if the

- #9

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Ok so lets name the spheres there is Sphere A with four Positive charges (just keeping things simple) and is at a higher Potential and the another sphere B has one Positive charge and is at a lower potential .

{That means the work done per charge on Bringing a test charge from a Point where we assume U to be 0 will be higher in case of A }

Now we connect them by a conducting wire , so the electrons from A will want to flow to B . and since the charge is conserved we have only 5 positive charges in the system .

Now what the charges on A and B could be like

5 0

6 -1

7 -2

8 -3

and similarly many keeping the charge +5 constant What happens then

- #10

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Hi. Say two charged conductors of charge +Q, -Q form condenser of electrostatic capacity C. So, potential difference is V=Q/C.

WHY: By current in connecting wire Q decrease so V also decrease.

WHEN: When Q=0, V=0 same potential.

Regards.

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I have also learnt that if there are two bodies(with similar characteristics) with charges Q1 and Q2 if they are brought in contact the charges gets distributed like (Q1 + Q2)/2 . Is that the case here

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I get what you are trying to say . but how does charge Q becomes 0 ?

WHY: By current in connecting wire Q decrease so V also decrease.

WHEN: When Q=0, V=0 same potential.

Regards.

- #13

tiny-tim

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Now we connect them by a conducting wire , so the electrons from A will want to flow to B . and since the charge is conserved we have only 5 positive charges in the system .

Now what the charges on A and B could be like

5 0

6 -1

7 -2

8 -3

and similarly many keeping the charge +5 constant What happens then

that's right!… if there are two bodies(with similar characteristics) with charges Q1 and Q2 if they are brought in contact the charges gets distributed like (Q1 + Q2)/2 . Is that the case here

so it'll go (it's easier with an

6 0

5 1

4 2

3 3

5 1

4 2

3 3

sooo … when the charges are equal, what is the potential difference (and

- #14

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When the charges are equal this means that they are at the same potential . So the potential Difference will be zero . Its very easy to understand that Equal charges are at the same potential . Is it like the Potential Energy required in bringing that charge from infinity to a point in space is same for the other charge since they are equal in magnitude . Is there any Mathematical Equation that proves it I mean I tried using6 0

5 1

4 2

3 3 [/INDENT]

sooo … when the charges are equal, what is the potential difference (andwhy?)

V(a) - V(b) = Integral from A to B E.dr

which should be zero but how ?

- #15

tiny-tim

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i thought these were

so … correction … the charges won't

so the question should be, why will the electrons keep moving while the potential difference is non-zero, and stop moving when the potential difference is zero?

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Hi.

You say Why Ohm's law V=RI.so the question should be, why will the electrons keep moving while the potential difference is non-zero, and stop moving when the potential difference is zero?

Regards.

- #17

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Hi.

Cancel of Q in positive charge plate and -Q in negative charge plate. Total discharge of battery.. but how does charge Q becomes 0 ?

Regards.

- #18

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I am still in Capacitance so No idea about Ohm's law . Also its almost time I have to go to school . If someone please please explain it I will be very thankful . Also if potential difference is zero why will electrons move ? If I am still not Familiar with current Electricity is this question out of the scope ?

@sweet springs I got that but what if both charges were of same polarity and different magnitude ?

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