1. Forces and Fields Lesson 5
2D Examples Using Coulomb's Law
Forces and Fields Lesson 5

2. Net Electrical Force Example 1: Determine the net force on object B.
always interpret this to mean that the
object in question is free to move and the
other objects are stationary.

3. Forces on B
Free body diagram

4. F C on B

5. F A on B

6. Fnet

7. Example 2: Three point charges, A, B, and C, are arranged in a line as shown.
a. Determine the net electrostatic force acting on charge B.

8. b. The charge on object C is negative
b. The charge on object C is negative. Identify the sign of the charge (+ or -) on object i. A. ii. B.

9. AB down on B 2D Example: Find the net electrical force on B. A
-2.0 x C
3.20 m
-1.5  C B C
4.1 m
-3.8  C
AB
down on B *

10. BC
left on B *

11. Draw Vector Diagram
3.05 x N
6.67 x N *

12. 2 D Example 2:
Three point charged objects are arranged in a right angle as shown in the diagram.
a. The charge on object A is positive. Identify the sign of the charge (+ or -) on object
i. B. (negative)
ii. C. (negative)

13. Read WB p. 85-86 TB p. 532-6 Examples 10.3 to 10.6 Do WB p.87 15-20
b. Determine the net electrostatic force acting on charge B.
Read WB p TB p Examples 10.3 to 10.6
Do WB p