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

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.

Forces on B Free body diagram

F C on B

F A on B

Fnet

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.

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.

AB down on B 2D Example: Find the net electrical force on B. A -2.0 x 10 -6 C 3.20 m -1.5  C B C 4.1 m -3.8  C AB down on B *

BC left on B *

Draw Vector Diagram 3.05 x 10 -3 N 6.67 x 10 -3 N *

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)

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. 85-86 TB p. 532-6 Examples 10.3 to 10.6 Do WB p.87 15-20