There is a point charge with charge q = - 3 × 10-6c. When it moves from point a to point B in the electric field, it does 6 × 10-4j work against the electric field force. When it moves from point B to point C, it does 9 × 10-4j work. Question: (1) what are the potential differences among AB, BC and Ca? (2) If the potential at point B is zero, what are the potentials at points a and C? What is the potential energy of charge at a and C?

There is a point charge with charge q = - 3 × 10-6c. When it moves from point a to point B in the electric field, it does 6 × 10-4j work against the electric field force. When it moves from point B to point C, it does 9 × 10-4j work. Question: (1) what are the potential differences among AB, BC and Ca? (2) If the potential at point B is zero, what are the potentials at points a and C? What is the potential energy of charge at a and C?

(1) In the process of negative charge moving from point a to point B, the charge overcomes the electric field force to do work, and it can be seen that the negative charge moves from the high potential to the low potential, that is, φ a ＞ φ B & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; potential difference UAB = WQ = - 6 × 10-4-3 × 10-6 = 200V & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp

To move the point charge of + 2 × 10 negative octave C from infinity to point a in the electric field, it is necessary to overcome the electric field force to do work of 8 × 10 negative sixth power J
1: 2: the work done by the electric field force when another point charge of negative fifth power C with charge quantity of - 2 × 10 is moved from point a to point B

If the potential at infinite distance is zero, then according to w = Qu, u = - 400V and the potential at point a is - 400V

If the point charge of negative 8th power C with charge q = 1.0 * 10 is moved from infinity to point a in the electric field, it is necessary to overcome the electric field force to do work w = 1.2 * 10 negative 4th power J
(1) The potential energy of Q at point a and the potential at point a (take the potential at infinity as zero)
(2) What is the potential of point a before Q moves into the electric field
We can go through the functional relationship until q is the electric potential energy in A. However, in the stem, we only tell the electric quantity, not the positive and negative. In this way, we can get two answers by Fai = EP / Q, which is obviously wrong. Because the electric potential is determined by the electric field itself, there is only one Fai, but the question is which one to choose? Positive or negative? And the positive electric potential energy must be greater than the negative electric potential energy, Is the positive potential necessarily greater than the negative potential?

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In vacuum, there are two point charges which are 0.3 meters apart and have the same amount of charge. The electrostatic force between them is 1 times 10 to the negative third power
In vacuum, there are two point charges which are 0.3 meters apart and have the same amount of charge. The size of the static electricity between them is 1 times 10 to the negative third power. How many element charges does each point charge carry?
K is 9.0 times 10 to the power of 9, and E is 1.6 times 10 to the power of minus 19

F=kqq/r^2
Q = R * radical (F / k) = 0.3 * radical [(10 ^ - 3) / (9 * 10 ^ 9)] = 9.99 * 10 ^ - 8 c
The charge quantity of each point charge is a multiple of the elementary charge
n=(9.99*10^-8)/(1.6*10^-19)=6.24*10^11
Equivalent to 6.24 * 10 ^ 11 elementary charges?