Electrostatics Test

Result

Electrostatics Test - 32

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Weekly Quiz Competition

Question 1
4 / -1

A
1/2

B
2

C

D

Solution
Question 2
4 / -1

ABC is a right angled triangle in which AB = 3 cm and BC = 4 cm and ∠ABC = π / 2. The three charges +15, +12 and –20 e.s.u. are placed respectively on A, B and C. The force acting on B is

A
125 dynes

B
35 dynes

C
25 dynes

D
Zero

Solution
Question 3
4 / -1

A
18 N

B
1.8 N

C
0.18 N

D
None of these

Solution
Question 4
4 / -1

Two charges q₁ and q₂ are placed in vacuum at a distance d and the force acting between them is F. If a medium of dielectric constant 4 is introduced between them, the force now will be

A
4F

B
2F

C

D

Solution
Question 5
4 / -1

Consider a neutral conducting sphere. A positive point charge is placed outside the sphere. The net charge on the sphere is then

A
Negative and distributed uniformly over the surface of the sphere

B
Negative and appears only at the point on the sphere closest to the point charge

C
Negative and distributed non-uniformly over the entire surface of the sphere

D
Zero
Question 6
4 / -1

A force F acts between sodium and chlorine ions of salt (sodium chloride) when put 1 cm apart in air. The permittivity of air and dielectric constant of water are ɛ₀ and K respectively. When a piece of salt is put in water electrical force acting between sodium and chlorine ions 1 cm apart is

A

B

C

D

Solution
Question 7
4 / -1

Two identical charges repel each other with a force equal to 10 mg wt when they are 0.6 m apart in air. (g = 10 ms^–2). The value of each charge is

A
2 mC

B
2 nC

C
2 × 10^–7C

D
2µC

Solution
Question 8
4 / -1

The value of electric permittivity of free space is

A
9 × 10⁹NC²/ m²

B
8.85 × 10^–12Nm²/ C² sec

C
8.85 × 10^–12C²/ Nm²

D
9 × 10⁹C²/ Nm²
Question 9
4 / -1

Two similar spheres having +q and –q charge are kept at a certain distance. F force acts between the two. If in the middle of two spheres, another similar sphere having +q charge is kept, then it experience a force in magnitude and direction as

A
Zero having no direction

B
8F towards +q charge

C
8F towards –q charge

D
4F towards +q charge

Solution
Question 10
4 / -1

A charge Q is divided into two parts of q and Q – q. If the coulomb repulsion between them when they are separated is to be maximum, the ratio of Q/q should be

A
2

B
1/2

C
4

D
1/4

Solution