Points A , B , and C are at the corners of an equilateral triangle of side 2.00
ID: 1423467 • Letter: P
Question
Points A, B, and C are at the corners of an equilateral triangle of side 2.00 m. Equal positive charges of 2.00 µC are at A and B.
(a) What is the potential at point C?
(b) How much work is required to bring a positive charge of 5.00 µC from infinity to point C if the other charges are held fixed?
Points A, B, and C are at the corners of an equilateral triangle of side 2.00 m. Equal positive charges of 2.00 C are at A and B (a What is the potential at point C? kV (b) How much work is required to bring a positive charge of 5.00 C from infinity to point C if the other charges are held fixed? (c) How much additional work is required to move the +5.00 point particle from point C to the midpoint of side AB?Explanation / Answer
a)potential at a point is given by = k*q / r
therfore, potential due to both the charges = 2*9*109 * 2* 10-6 / 2 = 18000 Nm/C
b) work done in bringing a charge from infinity = V*q' = 18000 * 5 *10-6 = 90*10-3 J = 90 mJ
c) Additional work is (V' - V)*q' = (9000*2*2 - 18000)*5 *10-6 = = 90*10-3 J = 90 mJ.