# Questions On Electric Charge! Trivia Quiz

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| By Mayurmishra735
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Mayurmishra735
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Quizzes Created: 1 | Total Attempts: 555
Questions: 9 | Attempts: 561

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• 1.

### A charge q is placed at the center of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to

• A.

-Q/2

• B.

-Q/4

• C.

+Q/4

• D.

+Q/2

B. -Q/4
Explanation
-Q/4 Use coulomb's law to find net force on any of Q & then make it equal to 0.

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• 2.

### Charge Q is divided into two parts which are then kept some distance apart. The force b/w them will be maximum if the two parts are

• A.

Q/2 each

• B.

Q/4 & 3Q/4

• C.

Q/3 & 2Q/3

• D.

None of these

A. Q/2 each
Explanation
Q/2 each since F is directly proportional to q1*q2

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• 3.

### Two identical metal balls with charges +2Q & -Q are separated by some distance, & exerts a force F on each other. They are joined by a conducting wire, which is then removed. The force between them will now be

• A.

F

• B.

F/2

• C.

F/4

• D.

F/8

D. F/8
Explanation
F/8 since charge is shared b/w two charges

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• 4.

### Two charges, each equal to Q, are kept at x = −a, and x = an on the x-axis. A particle of mass m and charge q=-Q/2 is placed at the origin. If charge q is given a small displacement along the y-axis, the net force acting on the particle is proportional to:

• A.

-y

• B.

1/y

• C.

-1/y

• D.

Y

A. -y
Explanation
Find net force

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• 5.

### Four charges, each equal to -Q are placed at the four corners of a square & a charge q is at its center. If the system is in equilibrium, the value of q is

• A.

-Q/4(1+2 √ 2)

• B.

Q/4(1+2 √ 2)

• C.

-Q/2(1+2 √ 2)

• D.

Q/2(1+2 √ 2)

B. Q/4(1+2 √ 2)
Explanation
Apply superposition principle & find net force then assign it to 0

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• 6.

### A soap bubble is given a negative charge, then its radius

• A.

Increase

• B.

Decrease

• C.

Remain unchanged

• D.

Fluctuate

A. Increase
Explanation
The bubble will expand because the charged ions inside it would all be the same, causing them to repel each other. This will happen to both positive and negatively charged bubbles because of the ionic similarity

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• 7.

### Two equal charges are separated by a distance d. A third charge placed on a perpendicular bisector at x distance from the centre will experience maximum coulomb force,when

• A.

x = (d/√2)

• B.

X = (d/2)

• C.

x = (d/2√2)

• D.

X = (d/2√3)

C. x = (d/2√2)
Explanation
Will be discussed in class

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• 8.

### Two small spherical balls each carrying a charge Q =  10 micro-coulomb are suspended by two insulating threads of equal lengths 1 each, from a point fixed in the ceiling. It is found that is equilibrium threads are separated by an angle 60º between them, as shown in the fig. What is the tension in the threads

• A.

18 N

• B.

1.8 N

• C.

0.18 N

• D.

None of the above

B. 1.8 N
Explanation
Apply Lami's theorem

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• 9.

### Two spherical conductors B and C having equal radii and carrying equal charges on them repel each other with a force F when kept apart at some distance. A third spherical conductor having the same radius as that of B but uncharged is brought in contact with B, then brought in contact with C and finally removed away from both. The new force of repulsion between B and C is -

• A.

3F/8

• B.

3F/4

• C.

F/4

• D.

F/8

A. 3F/8
Explanation
When the uncharged conductor is brought in contact with conductor B, some charge from B is transferred to the uncharged conductor. As a result, conductor B now has a reduced charge. When the uncharged conductor is brought in contact with conductor C, the charge is transferred from the uncharged conductor to conductor C. As a result, conductor C now has an increased charge. Since both conductors B and C have equal radii, the force of repulsion between them is directly proportional to the product of their charges. Therefore, when the charges on B and C change, the force of repulsion between them also changes. The new force of repulsion is 3F/8.

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• Current Version
• Mar 22, 2023
Quiz Edited by
ProProfs Editorial Team
• Apr 06, 2014
Quiz Created by
Mayurmishra735

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