1. Determine the charge of the unknown particle depicted in the figure. A.Positive B.Negative C.It can’t happen!

2. The magnitude of an electric field due to a point charge q at a distance r away depends on the strength of the charge of a test particle A.True B.False

3. Positively charged objects transfer positive charge to the earth when grounded. A.True B.False

4. The magnitude of an electric field is measured in SI units A.C B.N C.C/N D.N/C E.V F.A

5. A particle with no charge does not feel the effects of an electric field. A.True B.False

6. The charged particle in the middle experiences a force to the right. The particle has a _____ charge. A.Negative B.Positive C.It can’t be done!

7. Field lines always point ______ positive charges and _____ negative charges. A.towards, away from B.away from, towards C.away from, away from D.towards, towards

8. The electric field induced by the +4nC and -5nC particle at the location of the middle particle points A.left to right. B.right to left. C.up to down. D.down to up. E.not enough info!

9. Initially at rest, in what direction will the -5nC particle start moving? A.To the left B.To the right C.Up to the right D.Up to the left E.Upwards F.Downwards G.It wont, the forces from each +10 nC particle cancel.

10. When a charged particle moves in an electric field, its path follows a field line. A.True B.False

11. From the electric field line diagram to the right, we can conclude that the charges of q 1, q 2, and q 3 are A.equal in magnitude and sign. B.equal in sign only. C.equal in magnitude only.

12. From the electric field line diagram to the right, we can conclude that the signs of charges q 1, q 2, and q 3 are A.q 1 (+), q 2 (+), and q 3 (+) B.q 1 (+), q 2 (+), and q 3 (-) C.q 1 (+), q 2 (-), and q 3 (+) D.q 1 (+), q 2 (-), and q 3 (-) E.q 1 (-), q 2 (+), and q 3 (+) F.q 1 (-), q 2 (+), and q 3 (-) G.q 1 (-), q 2 (-), and q 3 (+) H.q 1 (-), q 2 (-), and q 3 (-)