© 2012 Pearson Education, Inc. { Chapter 23 Electric Potential (cont.)

© 2012 Pearson Education, Inc. Where an electric field line crosses an equipotential surface, the angle between the field line and the equipotential is Q23.10 A. zero. B. between zero and 90°. C. 90°. D. not enough information given to decide

© 2012 Pearson Education, Inc. Where an electric field line crosses an equipotential surface, the angle between the field line and the equipotential is A23.10 A. zero. B. between zero and 90°. C. 90°. D. not enough information given to decide

© 2012 Pearson Education, Inc. The direction of the electric potential gradient at a certain point Q23.11 A. is the same as the direction of the electric field at that point. B. is opposite to the direction of the electric field at that point. C. is perpendicular to the direction of the electric field at that point. D. not enough information given to decide

© 2012 Pearson Education, Inc. The direction of the electric potential gradient at a certain point A23.11 A. is the same as the direction of the electric field at that point. B. is opposite to the direction of the electric field at that point. C. is perpendicular to the direction of the electric field at that point. D. not enough information given to decide

© 2012 Pearson Education, Inc. { Chapter 24 Capacitance

© 2012 Pearson Education, Inc. The two conductors a and b are insulated from each other, forming a capacitor. You increase the charge on a to +2Q and increase the charge on b to –2Q, while keeping the conductors in the same positions. As a result of this change, the capacitance C of the two conductors A.becomes 4 times great. B.B. becomes twice as great. C. remains the same. D. becomes 1/2 as great. E. becomes 1/4 as great. Q24.1

© 2012 Pearson Education, Inc. A24.1 The two conductors a and b are insulated from each other, forming a capacitor. You increase the charge on a to +2Q and increase the charge on b to –2Q, while keeping the conductors in the same positions. As a result of this change, the capacitance C of the two conductors A.becomes 4 times great. B.B. becomes twice as great. C. remains the same. D. becomes 1/2 as great. E. becomes 1/4 as great.

© 2012 Pearson Education, Inc. You reposition the two plates of a capacitor so that the capacitance doubles. There is vacuum between the plates. If the charges +Q and –Q on the two plates are kept constant in this process, what happens to the potential difference V ab between the two plates? A. V ab becomes 4 times as great. B. V ab becomes twice as great. C. V ab remains the same. D. V ab becomes 1/2 as great. E. V ab becomes 1/4 as great. Q24.2

© 2012 Pearson Education, Inc. A24.2 A. V ab becomes 4 times as great. B. V ab becomes twice as great. C. V ab remains the same. D. V ab becomes 1/2 as great. E. V ab becomes 1/4 as great. You reposition the two plates of a capacitor so that the capacitance doubles. There is vacuum between the plates. If the charges +Q and –Q on the two plates are kept constant in this process, what happens to the potential difference V ab between the two plates?