FSKS 123: Chapter 18-20

How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +3.8 μC?

Answer explanation

Choose the diagram in which all forces are correctly labelled and in the correct direction

• 
• 
• 
• 

Find the magnitude of the force experienced by charge q1 due to charge q3.

• 32 928 972 N

• 0.329 N

• 0.211 N

Answer explanation

Use pythagoras to get distance. Also, double check that you are using meters and Coulomb

Find the correct angle for each of the forces.

(we always measure from + x-axis)

Answer explanation

Start measuring from the + x-axis!

Draw your x-axis and y-axis from the particle that is experiencing the force

Calculate the angle of the force that q1 experiences due to the presence of q3

Answer explanation

Draw the arrow indicating the force.

The draw the angle starting from positive x-axis

Calculate the missing theta using inverse tan.

• 54.25
• 234.25
• 324.25
• 34.25
• -0.257
• -0.357
• 0.440
• 0.767

Answer explanation

Three point charges have equal magnitudes.

Rank the net electrostatic force that each particles experiences in ascending order (smallest first) according to magnitude.

• A

• C

• B

Answer explanation

The drawing shows some electric field lines. For the points indicated, rank the magnitudes of the electric field in ascending order (smallest first).

• C

• B

• A

Answer explanation

The positive charge has the greater magnitude. Where on the line that passes through the charges is the one spot where the total electric field is zero?

Answer explanation

Answer explanation