Exam 1

Question 1

T/F: If an object looses an electron, it will be negatively charged

Answer 1

F

Question 2

T/F: If a negative charge is free to move in an electric field it will move toward higher potentials.

Answer 2

T

Question 3

T/F: Electric field lines are drawn in such a way that they are tangent to equipotential surfaces.

Answer 3

F

Question 4

By tripling the separation between two positive point charges, the potential energy stored in the system will…
stay the same?
increase by a factor of 3.
decrease by a factor of 9.
decrease by a factor of 3.

Answer 4

decrease by a factor of 3

Question 5

a charge of -3.0nC is in a point where there is an electric field of 3.6 * 10^6 N/C. What is the magnitude and direction of the electric force acting on this charge?
1.210^15 N in the same direction as the e. field
1.210^15N in the opposite direction of the e.field
1.110^-3N in the same direction as the e.field
1.110^-3N in the opposite direction of the e.field

Answer 5

1.1 * 10^-3 in the opposite direction of the electric field

Question 6

In a uniform electric field, the potential difference between 2 points is 50V. If these points are 1 mm apart, and the line connecting them is parallel to the electric field, what is the strength of the electric field?
50 V/m
50,000 V/m
0.02 V/m
500 V/m

Answer 6

50,000 V/m

Question 7

2 capacitors with different capacitances are connected in series and the combination is connected to a battery. Which capacitor does have more voltage?
the one with less capacitance
they both have the same voltage
the one with more capacitance
impossible to say

Answer 7

the one with less capacitance

Question 8

A conducting spherical shell has +2C net charge. A -3C charge s placed at the center of the shell (without contacting the inner surface). How much charge will be distributed on the inner and outer surfaces of the shell, respectively?
0C and +2C
+3C and +1C
+3C and -1C
+3c and +2C

Answer 8

+3C and -1C

Question 9

A parallel-plate capacitor with a dielectric is fully charged and then is disconnected from the battery. Then the dielectric material is taken out of the capacitor. What happens to the charge and the energy stored in this capacitor?
energy and charge both decrease
energy and charge both stay constant
energy and charge both increase
energy increases and charge stays constant

Answer 9

energy increases and charge stays constant