Question

6. (17.48) As an electron moves through a region of space, its speed decreases from 6.50 x 10^6 m/s to 2.60 x 10^6 m/s. The electric force is the only force acting on the electron.

   1. a) Did the electron move to a higher potential or a lower potential? Explain your reasoning in complete sentences.

   2. b) Across what potential difference did the electron travel?

7. (17.62, modified) A parallel plate capacitor has plates of area 1.00 cm2 separated by 0.250 mm. There is a charge of magnitude 8.00 pC on each plate.

   a) Calculate the potential difference between the plates.   b) Calculate and the electric field between the plates. c) If the plate separation is doubled and the charge is kept constant, what will happen to the potential difference and the electric field? Explain your reasoning in complete sentences or by showing your calculations.   d) Produce a sketch of a parallel plate capacitor. Include the sign of the charge on each plate, the electric field lines and the equipotential lines. Label where the electric potential is greatest.

Answer 1

17.48)

The electron moved towards a lower potential because it only possible that an electron experiences a repulsive force when traveling towards a lower potential and hence its speed decreases.

b)