Electrostatics Test

Result

Electrostatics Test - 73

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Weekly Quiz Competition

Question 1
4 / -1

Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle 30° with each other. When suspended in a liquid of density 0.8g cm^–3, the angle remains the same. If density of the material of the sphere is 1.6 g cm^–3, the dielectric constant of the liquid is

A
1

B
4

C
3

D
2

Solution
Question 2
4 / -1

A
+2

B
–1

C
–2

D
Zero

Solution
Question 3
4 / -1

A negatively charged plate has charge density of 2 × 10^–6 C /m². The initial distance of an electron which is moving towards the plate, cannot strike the plate, if it is having energy of 200 eV

A
1.77 mm

B
3.51 mm

C
1.77 cm

D
3.51 cm

Solution
Question 4
4 / -1

The charge on 500 cc of water due to protons will be

A
6.0 × 10²⁷ C

B
2.67 × 10⁷ C

C
6 × 10²³ C

D
1.67 × 10²³ C

Solution
Question 5
4 / -1

Electric potential is given by
V = 6x – 8xy² – 8y + 6yz – 4z²Then electric force acting on 2C point charge placed on origin will be

A
2 N

B
6 N

C
8 N

D
20 N

Solution
Question 6
4 / -1

The electric field in a region is radially outward with magnitude E = Aγ₀ . The charge contained in a sphere of radius γ₀ centered at the origin is

A

B

C

D

Solution
Question 7
4 / -1

Charge q is uniformly distributed over a thin half ring of radius R. The electric field at the centre of the ring is

A

B

C

D

Solution
Question 8
4 / -1

In the given figure two tiny conducting balls of identical mass m and identical charge q hang from non-conducting threads of equal length L. Assume that θ is so small that tan θ ≈ sin θ , then for equilibrium x is equal to

A

B

C

D

Solution
Question 9
4 / -1

Consider two points 1 and 2 in a region outside a charged sphere. Two points are not very far away from the sphere. If E and V represent the electric field vector and the electric potential, which of the following is not possible

A

B

C

D
Question 10
4 / -1

Three positive charges of equal value q are placed at the vertices of an equilateral triangle. The resulting lines of force should be sketched as in

A

B

C

D