Finding Zero Potential Points on the x-axis with Two Charges

In summary, two charges of 3uC and -4uC are placed along the x-axis at 14 cm and 15 cm, respectively. The task is to find points along the x-axis where the potential is zero. To solve this, one can use the equation V=q/r, where r is the distance from the charge to the point of calculation. When V=0, r can either be infinite or zero. To determine the exact values, one can write r2 in terms of r1 and the separation between them before solving for V1 = -V2. This method can be applied to all three cases between and outside the two charges.
  • #1
andy2004
3
0
Two charges are placed along the x-axis; 3uC at 14 cm, and -4uC at 15 cm. Find those points along the x-axis where the potential is zero. (u = micro or 10^-6)
 
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  • #2
Well, what have you done? you know potential is a scalar quantity, simply solve for r.
 
  • #3
when i solve it, the v=q/r which means r = q/v, if v=0 then r=q/0. does that means r= infinite or r=zero. I am thinking infinite.
 
  • #4
Andy, the r's in the equation is the distance from the particular charge up to the point where you want to calculate the potential. Write r2 in terms of r1 and the separation beween them before you solve for V1 = -V2. Try to solve for all three cases in between the two charges and on both sides outside of the two.
 

1. What is electric potential?

Electric potential is a measure of the electric potential energy per unit charge at a particular point in an electric field.

2. How is electric potential different from electric field?

Electric field is a vector quantity that describes the strength and direction of the force experienced by a charged particle, while electric potential is a scalar quantity that describes the potential energy per unit charge at a particular point in the electric field.

3. What is the unit of electric potential?

The unit of electric potential is joules per coulomb (J/C) or volts (V).

4. How is electric potential calculated?

Electric potential is calculated by dividing the electric potential energy by the charge at a particular point in the electric field. It can also be calculated by multiplying the electric field strength by the distance between two points.

5. What is the difference between electric potential and electric potential energy?

Electric potential is a measure of the electric potential energy per unit charge at a particular point in the electric field, while electric potential energy is the potential energy of a charged particle due to its position in an electric field.

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