Electrostatics Test

Result

Electrostatics Test - 131

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Question 1
4 / -1

A positively charged ball hangs from a silk thread. We put a positive test charge q₀ at a point and measure F/q₀, then it can be predicted that the electric field strength E

A
> F/q₀

B
= F/q₀

C
0

D
Cannot be estimated

Solution
Question 2
4 / -1

A solid metallic sphere has a charge +3Q. Concentric with this sphere is a conducting spherical shell having charge –Q. The radius of the sphere is a and that of the spherical shell is b(b > a). What is the electric field at a distance R(a < R < b) from the centre?

A

B

C

D

Solution
Question 3
4 / -1

If on the concentric hollow spheres of radii r and R(>r) the charge Q is distributed such that their surface densities are same then the potential at their common centre is

A

B

C
Zero

D

Solution
Question 4
4 / -1

Two equal charges q of opposite sign separated by a distance 2a constitute an electric dipole of dipole moment p. If P is a point at a distance r from the centre of the dipole and the line joining the centre of the dipole to this point makes an angel θ with the axis of the dipole, then the potential at P is given by (r >> 2a) (where p = 2a)

A

B

C

D

Solution
Question 5
4 / -1

A point charge q is placed at a distance a/2 directly above the centre a square of side a. The electric flux through the square is

A
q/ɛ₀

B
q/πɛ₀

C
q/4ɛ₀

D
q/6ɛ₀

Solution
Question 6
4 / -1

A

B

C

D

Solution
Question 7
4 / -1

Two identical thin rings each of radius R meters are coaxially placed at a distance R meters apart. If Q₁ coulomb and Q₂ coulomb are respectively the charges uniformly spread on the two rings, the work done in moving a charge q from the centre of one ring to that of other is

A
Zero

B

C

D

Solution
Question 8
4 / -1

A
+2

B
–1

C
–2

D
Zero

Solution
Question 9
4 / -1

A negatively charged plate has charge density of 2 × 10^–6 C /m². The initial distance of an electronwhich 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 10
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