Question 1 [2pts]
Two balloons have an identical charge of – 6.25 nC. Calculate the magnitude of the
electrical force of attraction between them if they are held at a distance of 61.7 cm.
Question 2 [3pts]
Two negative charges are pulling a positive charge of magnitude 3.0 µC. One of the
negative charges has a charge of -2.0 µC and is at a distance of 0.050 m to the west of
the positive charge, and the other, -4.0 µC, is 0.030m to the east. Determine the net
force exerted on the positive charge.
Question 3 [6pts]
[1pt]
[3pts]
[1pt]
[1pt]
Question 4 [5pts]
A negative charge of -Q is placed at (3,0) m and a positive charge of +4Q is placed at
(-3,0) m as shown in the figure above.
a) Find the location on the x-axis where the electric field due to the two charges is
zero.
b) Find the location on the x-axis where the electric potential due to the two charges
is zero.
c) If Q = 2.0 µC, determine the acceleration of the electron released from rest at the
origin.
Question 5 [4pts]
Four-point charges are placed at the corners of a square of side a as shown in the figure
above. Determine the magnitude and direction of the resultant electric force on q, with
k, q and a left in symbolic form.