To apply Problem-Solving Strategy 18.1 Calculation of potential. Three point cha

Question

To apply Problem-Solving Strategy 18.1 Calculation of potential.

Three point charges with values q1 = 8.00nC , q2 = 3.00nC , and q3 = 7.00nC are placed on three consecutive corners of a square whose side measures s = 5.00m . Point A lies at the fourth corner of the square, diagonally across from q2. Point B lies at the center of the square. What are the values of the electric potential at point A and at point B? How much energy (supplied as work) is required to move a test charge q4 = 2.00nC from point A to point B? Assume the zero of electric potential is chosen to be at infinity.

What is the electric potential at point A?

Express your answer numerically in volts.

Explanation / Answer

potential at A

Va=kq1/s+kq2/(2s2)1/2+kq3/s

potential at B

Vb=kq1/r=kq2/r+kq3/r

where r=sqroot(2(s/2)2)

work done=(Va-Vb)q4

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