The document discusses Coulomb's law and electric fields. It defines electric fields as the force a charge would feel at a given location. Electric fields are calculated similarly to Coulomb's law but for any location, not just where a charge is located. Electric field lines are used to represent electric fields graphically, with closer lines indicating stronger fields and arrow directions showing the field direction. Conductors have no electric field inside them as free electrons redistribute to eliminate any field.

15. Preflight 2.5 Charge A is 1) positive 2) negative 3) unknown A B X Y

16. Preflight 2.6 A B X Y Compare the ratio of charges Q A / Q B 1) Q A = 0.5Q B 2) Q A = Q B 3) Q A = 2 Q B A B X Y

17. Preflight 2.8 The magnitude of the electric field at point X is greater than at point Y 1) True 2) False A B X Y

18. ACT: E Field Lines Compare the magnitude of the electric field at point A and B 1) E A >E B 2) E A =E B 3) E A <E B A B

20. Preflight 2.10 &quot;Charge A&quot; is actually a small, charged metal ball (a conductor). The magnitude of the electric field inside the ball is: (1) Negative (2) Zero (3) Positive A B X Y

21. Demo: E-field from dipole x y C A B