13. An electron initially moving to the right when it enters a region of uniform

Question

13. An electron initially moving to the right when it enters a region of uniform electric field directed upwards. Which trajectory shown below will the electron follow in the electric field? a. w d. Z 14. An uncharged conductor has a hollow cavity inside of it. Within this cavity there is a charge of +10OUC that does not touch the conductor. There are no other charges in the vicinity. Which statement about this conductor is true? (There may be more than one correct choice.) a. The net electric field within the material of b. The outer surface of the conductor contains +10uC of charge and the inner surface contains-10uC the conductor points away from the +10uC charge. c. The inner surface of the conductor carries a charge of -10uC and its outer surface carries no excess charge d. Both surfaces of the conductor carry no excess charge because the conductor is uncharged 15. A certain capacitor discharges through a resistor with a time constant of 2ms. To increase the time constant to 4ms one could to which of the following? a. Decrease the resistance be a factor of % b. increase the resistance by a factor of 2 c. increase the length of the connecting wire by a factor of 2 d. you need to know the capacitance in order to answer this questiosn 16. A negative charge is moved from point A to point B along an equipotential surface. Which of the following statements must be true for this case? a. No work is required to move the negative charge from point A to point B b. Work is done to move the negative charge from point A to point B c. The work done on the charge depends on the distance between points A and B d. The negative charge performs work in moving from point A to point B 17. Three point charges of-2.00 pC, +4.00 pC, and +6.00 c are placed along the x-axis as shown in the figure. What is the electrical potential at point P (relative to infinity) due to these charges? (-14m 899 x 109 N·m2/C2)

Explanation / Answer

13) Ans: c. Y

Using right hand palm rule, the force on the electron due to the magnetic field is in the north direction and hence it follows the trajectory Y.

X is not correct even though it also points to the north because the electron cannot just make a 90 degrees turn and start moving north since it has initial east velocity.

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