A set of point charges is held in place at the vertices of an equilateral triang

Question

A set of point charges is held in place at the vertices of an equilateral triangle of side 10.0 cm , as shown in (Figure 1) .

Part A

What is the electric potential energy of the 3.00 nC charge?

Express your answer in joules to three significant figures.

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Part B

What would be the maximum kinetic energy of the 3.00 nC charge if it were released from rest in the frictionless void of outer space? (Assume the other charges are held in place.)

Express your answer in joules to three significant figures.

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Part C

When will this maximum kinetic energy be achieved, just following the release of the charges or after a very long time?

A set of point charges is held in place at the vertices of an equilateral triangle of side 10.0 cm , as shown in (Figure 1) .

Part A

What is the electric potential energy of the 3.00 nC charge?

Express your answer in joules to three significant figures.

  J  

SubmitMy AnswersGive Up

Part B

What would be the maximum kinetic energy of the 3.00 nC charge if it were released from rest in the frictionless void of outer space? (Assume the other charges are held in place.)

Express your answer in joules to three significant figures.

  J  

SubmitMy AnswersGive Up

Part C

When will this maximum kinetic energy be achieved, just following the release of the charges or after a very long time?

When will this maximum kinetic energy be achieved, just following the release of the charges or after a very long time? after a very long time just following the release of the charge

Explanation / Answer

A)

electric potential energy of Q3 = - 3 nC is given as

r = length of side of triangle = 10 cm = 0.10 m

U = k Q3 Q1/r + k Q3 Q2/r = k Q3 (Q1 + Q2)/r = (9 x 109) (- 3 x 10-9) (-4 - 2) (10-9)/0.10 = 1.62 x 10-6 J

b)

using conservation of energy

KEmax = maximum kinetic energy = electric potential eneregy lost = 1.62 x 10-6 J

c)

after a very long time

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