Electrostatics Test

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Electrostatics Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

A soap bubble is given negative charge. Its radius will

A
Increase

B
Decrease

C
Remain unchanged

D
Fluctuate

Solution

Due to repulsive force.
Question 2
1 / -0

Which of the following charge is not possible

A
1.6 × 10^-18 C

B
1.6 × 10^-19 C

C
1.6 × 10^-20 C

D
None of these

Solution

1.6 × 10^-20 C, because this is 1 / 10 of electronic charge and hence not an integral multiple.
Question 3
1 / -0

Five balls numbered 1 to 5 balls suspended using separate threads. Pair (1,2), (2,4) and (4,1) show electrostatic attraction, while pair (2,3) and (4,5) show repulsion. Therefore ball 1 must be

A
Positively charged

B
Negatively charged

C
Neutral

D
Made of metal

Solution

Since 1 does not enter the list of repulsion, it is just possible that it may not be having any charge. Moreover, since ball no. 1 is being attracted by 2 and 4 both. So 2 and 4 must be similarly charged, but it is also given that 2 and 4 also attract each other. So 2 and 4 are certainly oppositely charged.

Since 1 is attracting 2, either 1 or 2 must be neutral but since 2 is already in the list of balls repelling each other, it necessarily has some charge, similarly 4 must have some charge. It means that though 1 is attracting 2 and 4 it does not have any charge.
Question 4
1 / -0

If the radius of a solid and hollow copper spheres are same which one can hold greater charge

A
Solid sphere

B
Hollow sphere

C
Both will hold equal charge

D
None of these

Solution

Charge resides on the surface of conductor, since both the sphere having similar surface area so they will hold equal charge.
Question 5
1 / -0

Two point charges 1 μC & 5 μC are separated by a certain distance. What will be ratio of forces acting on these two

A
1:5

B
5:1

C
1:1

D
0

Solution

Both the charges will experience same force so ratio is 1 : 1

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Re-Attempt Weekly Quiz Competition

Electrostatics Test - 1

Result

Electrostatics Test - 1

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Rank

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SHARING IS CARING

Question 1

Increase

Decrease

Remain unchanged

Fluctuate

Solution

Question 2

1.6 × 10-18 C

1.6 × 10-19 C

1.6 × 10-20 C

None of these

Solution

Question 3

Positively charged

Negatively charged

Neutral

Made of metal

Solution

Question 4

Solid sphere

Hollow sphere

Both will hold equal charge

None of these

Solution

Question 5

1:5

5:1

1:1

0

Solution

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1.6 × 10^-18 C

1.6 × 10^-19 C

1.6 × 10^-20 C