I need help on this problem, it appeared on a test and I need to figure out what

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I need help on this problem, it appeared on a test and I need to figure out what the solution is. I also need to know what I did wrong.

I will rate the answer, thank you.

Q4. (12points) A charge q +5HC is located at -3 m on the xaxis. A negative charge q2 -2 uC is at 3m on the x axis. (hw3b 2.,3c. 5, and some other similar ones...) x 3 m 3 m 1. Calculate the electric field and show its direction at a point Palong the axis at x 2.0 m. Draw to show the E field at location P. due to charge 1, charge 2 and the total E field, respectively. 2 MC 2. Calculate the electric potential at a point Palong the axis at x 2.0 3. To move a third charge (which is initially static) (q3 1.0 uC) from infinity to x 2.0 m, what is the minimum required work? (Hint: Can you find the Potential energy change for the system before and after moving the third charge? Or the potential energy change for the third charge)

Explanation / Answer

2) whicle calculatinf electic ptential you need to put righr r values

that is 2m and 5m for 1 and 2 respectively and add them algebraically as it is scalar quantity.

3) Work done = q3xV

where V is electric potental at that point.

4) electric potenial energy

before

Ui = kq1q2/r12

r12 = distance between charge 1 and 2

after

Uf = k(q1q2/r12 +q2q3/r23 +q1q3/r13)

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