Question

#1 The three charges are at the three vertices of a right triangle as shown in the figure below.

q 1 = + 3.0 µC q 2 = - 3 .0 µC q 3 = - 2 .0 µC 1 µC = 10-6

Right Triangle: q1 to q2 = 5.0m/ q1 to q3 = 3.0m / q2 to q3 = 4.0m

Formulas: K = 9.0 X 10 9 N m2/ C2 Fx = F cos θ Fy = F sin θ

a) Calculate the force acting on on q 3 by q 1. Name this force F1 .

b) Calculate the force acting on q 3 by q 2 . Name this force F2.

c) Draw the force acting on q 3 by q 1 and q 2 on the figure .

b) Find the components of force F1 on X and Y-axes.

d) Find the components of force F2 on X and Y-axes.

e) Find the net force in X-direction. Fnet X =

f) Find the net force in Y-direction Fnet Y =

g) Use Pythagorean Theorem to find the resultant force acting on q 3.

h) Use tangent to find the direction (angle) the resultant makes with horizontal.  

#2 Show formulas, calculations , and direction for the following questions.

a. What is the strength of an electric field that will balance the weight of a proton?

b. What is the direction of an electric field that will balance the weight of a proton?

c. What is the strength of an electric field that will balance the weight of an electron?

d. What is the direction of an electric field that will balance the weight of an electron?

Answer 1