At the vertices of an equilateral triangle with a side 20 cm there are three electrical charges, two of them + 0.1μC and the other +0.2 μC. Calculate: a) The electric potential at the geometric center of the triangle. b) Potential energy of a charge of - 2 μC located at that point.

Two charges of q1 = 1.9 µC and q2 = −2.9 µC are d = 0.46 m apart at two vertices of an equilateral triangle as in the figure below.  (a) What is the electric potential due to the 1.9-µC charge at the third vertex, point P? (in volts)  (b) What is the electric potential due to the −2.9-µC charge at P? (in volts)  (c) Find the total electric potential at P. (in volts)  (d) What is the work required to move a 4.0-µC charge from infinity to P? (in joules)

Three point-like charges are placed at the following points on the x-y system coordinate qi is fixed at x = -3.00 m, 92 is fixed at x+3.00 m, and ga is fixed at the origin of the system coordinate. Find the electric potential at y - -2.00 m. Let q -3.00 uC, and qa= -5.20 4. µC, and q3 = -8.90 µC. =E + a) -2.46 x 10 V b) -6.05 x 10* V Ey: Eny-Esy=0 c) 1.96 x 10 V -S.aul d) -3.45 x 10 V e) 6.46 x 10 V

Two identical point charges, each of 2.0 nC are held fixed on the x-axis, one at x= -3.0 cm, y =0 and the other at x = +3.0 cm, y= 0. In what follows, the electric potential is taken to be zero at infinity.   Calculate the electric potential VA at location A of coordinates x = 0, y= +4.0 cm, and the electric potential VB at location B of coordinates x = 0, y = 0 (the origin).  An electron is released from rest at location A and immediately starts moving along the y axis towards location B. Use conservation of energy to calculate the speed of the electron when it reaches location B.