Please explain to me why the answer to 6 is C and why the answer to 7 is E. If n

Question

Please explain to me why the answer to 6 is C and why the answer to 7 is E. If none of them are correct, what should 7 be?

For the next three questions, consider two identical negatively charged particles with charge "-Q" and mass "m" They are initially placed a distance "L" apart in empty space, at rest. (There is no gravity or any other force besides the electrical force between the particles) -Q -Q (Please look carefully at the answers, some of them differ in subtle ways) 6) The particles are both released. What is the magnitude of the initial acceleration of the left-hand particle? B) k QImL (note: neither Q nor L are squared in this one) E) None of the above is the correct formula for the magnitude of acceleration of the particle 7) What is the potential energy of the system at the moment of release. (Assume PE-0 at infinity) C) -kQIL D) +kQ/L (note: neither Q nor L are squared in this one) E) None of the above is the correct formula for the potential energy of the system

Explanation / Answer

6

Electric force between the charge = F = k Q2/L2

acceleration, a = F/m = k Q2/(mL2)

7.

Potential energy = k (-Q) (-Q) / L = k Q2/L

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