Multiple choice questions on electrostatics.
Question 1: If there is a force of 5.0 x 10-12 N acting to the left on an electron, the electric field intensity at the location of this electron will be:
a. zero.
b. 8.0 x 10-31 N/C to the left
c. 3.1 x 107 N/C to the left
d. 3.1 x 107 N/C to the right
e. none of these
Question 2: In one mole or 18 grams of water, the total negative charge of all the electrons is:
a. zero because its electrically neutral.
b. less than one C
c. almost 100,000 C.
d. almost one million C.
e. none of these
Question 3: Consider three identical metal spheres that are mounted on insulating stands. Sphere X is neutral, sphere Y has a charge -1q, and sphere Z has a charge +4q. Y and Z are touched together and then separated.
a. Each is now charged, with a charge +1.5 q
b. Each is now charged, with a charge +2.5 q
c. Each is now charged, with a charge +3 q
d. Sphere Y has charge +4 q, sphere Z now has charge -1 q
e. none of these
Question 4: Consider a small, conducting sphere of 0.0010 kg mass. Extra electrons are added to this sphere and an identical sphere below it so that the excess charge on the top sphere is three times that on the lower one. How much extra charge would have to be placed upon the top sphere so that the electrical repulsion between the extra charge on these spheres would provide a force equal to the weight of the sphere when the spheres are 4.0 m apart?
a. 5.8 x 10-12C
b. 2.4 x 10-6 C
c. 3.6 x 10-6 C
d. 7.2 x 10-6 C
e. none of these
Question 5: Consider a small, conducting sphere of 0.0010 kg mass. Extra electrons are placed on this sphere and on an identical sphere 3.0 m below it so the repulsion between these extra electrons provides a force equal to the weight of the top sphere. How many electrons must be added to each sphere?
a. 5.0 x 10-25
b. 3.1 x 10-6
c. 2.0 x 1013
d. 3.9 x 1013
e. none of these
Question 6:
Electrical charge interaction can be summarized by:
a. - charge repels other - charge.
b. + charge repels other + charge.
c. - charge and + charge attract each other.
d. All of these.
e. None of these.
Question 7: Consider two point charges that are separated by a distance, 2r. If this distance between them is increased to 5 r, the force between the charges is:
a. 1/25 as great as it had been
b. 4/25 as great as it had been
c. 1/9 as great as it had been
d. 25 times as great as it had been
e. none of these
Question 8: The electric field is zero:
a. inside any conductor.
b. inside any conductor with a static charge.
c. inside any material, conductor or insulator, with a static charge.
d. Never.
e. Always.
Question 9:
If the symbols ] and [ are used to represent a pair of charged plates, in the sketch below,
+] [-
the field between the two plates would be directed:
a. upward.
b. to the left.
c. to the right.
d. zero, so its direction would be without meaning.
e. none of these
Question 10: Consider three identical metal spheres that are mounted on insulating stands. Sphere X is neutral, sphere Y has a charge -1q, and sphere Z has a charge +4q. X and Y are touched together and then separated.
a. Each is now charged, with a charge -0.5 q.
b. Each is now charged, with a charge -1 q
c. Sphere X is neutral, sphere Y has a charge -1q
d. Sphere X has charge -1 q, sphere Y is now neutral
e. none of these
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10 multiple choice questions on electrostatics and capacitors are solved with detailed explanations.
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Question 1:
If there is a force of 5.0 x 10-12 N acting to the left on an electron, the electric field
intensity at the location of this electron will be:
a. zero.
b. 8.0 x 10-31 N/C to the left
c. 3.1 x 107 N/C to the left
d. 3.1 x 107 N/C to the right
e. none of these
Question 2:
In one mole or 18 grams of water, the total negative charge of all the electrons is:
a. zero because its electrically neutral.
b. less than one C
c. almost 100,000 C.
d. almost one million C.
e. none of these
Question 3:
Consider three identical metal spheres that are mounted on insulating stands. Sphere X is
neutral, sphere Y has a charge -1q, and sphere Z has a charge +4q. Y and Z are touched
together and then separated.
a. Each is now charged, with a charge +1.5 q
b. Each is now charged, with a charge +2.5 q
c. Each is now charged, with a charge +3 q
d. Sphere Y has charge +4 q, sphere Z now has charge -1 q
e. none of these
Question 4:
Consider a small, conducting sphere of 0.0010 kg mass. Extra electrons are added to this
sphere and an identical sphere below it so that the excess charge on the top sphere is three
times that on the lower one. How much extra charge would have to be placed upon the
top sphere so that the electrical repulsion between the extra charge on these spheres
would provide a force equal to the weight of the sphere when the spheres are 4.0 m apart?
a. 5.8 x 10-12C
b. 2.4 x 10-6 C
c. 3.6 x 10-6 C
d. 7.2 x 10-6 C
e. none of these
Question 5:
Consider a small, conducting sphere of 0.0010 kg mass. Extra electrons are placed on this
sphere and on an identical sphere 3.0 m below it so the repulsion between these extra
electrons provides a force equal to the weight of the top sphere. How many electrons
must be added to each sphere?
a. 5.0 x 10-25
b. 3.1 x 10-6
c. 2.0 x 1013
d. 3.9 x 1013
e. none of these
Question 6:
Electrical charge interaction can be summarized by:
a. - charge repels other - charge.
b. + charge repels other + charge.
c. - charge and + charge attract each other.
d. All of these.
e. None of these.
Question 7:
Consider two point charges that are separated by a distance, 2r. If this distance between
them is increased to 5 r, the force between the charges is:
a. 1/25 as great as it had been
b. 4/25 as great as it had been
c. 1/9 as great as it had been
d. 25 times as great as it had been
e. none of these
Question 8:
The electric field is zero:
a. inside any conductor.
b. inside any conductor with a static charge.
c. inside any material, conductor or insulator, with a static charge.
d. Never.
e. Always.
Question 9:
If the symbols ] and [ are used to represent a pair of charged plates, in the sketch below,
+] [-
the field between the two plates would be directed:
a. upward.
b. to the left.
c. to the right.
d. zero, so its direction would be without meaning.
e. none of these
Question 10:
Consider three identical metal spheres that are mounted on insulating stands. Sphere X is
neutral, sphere Y has a charge -1q, and sphere Z has a charge +4q. X and Y are touched
together and then separated.
a. Each is now charged, with a charge -0.5 q.
b. Each is now charged, with a charge -1 q
c. Sphere X is neutral, sphere Y has a charge -1q
d. Sphere X has charge -1 q, sphere Y is now neutral
e. none of these
"Sorry I attached the wrong figure for this question but seems your answer is still right. May I resend the problem with the correct figure and let you to double check with it? If I may, how to attach the correct figure?"
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"Thanks Mukund Very well presented"
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