Electrostatics Test

Result

Electrostatics Test - 36

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Weekly Quiz Competition

Question 1
4 / -1

Two protons are a distance of 1 × 10^–10cm from each other. The forces acting on them are

A
Nuclear force and coulomb force

B
Nuclear force and gravitational force

C
Coulomb force and gravitational force

D
Nuclear, coulomb and gravitational force
Question 2
4 / -1

Two identical conducting balls A and B have positive charges q₁ and q₂ respectively. But q₁ ≠ q₂. The balls are brought together so that they touch each other and then kept in their original positions. The force between them is

A
Less than that before the balls touched

B
Greater than that before the balls touched

C
Same as that before the balls touched

D
Zero

Solution
Question 3
4 / -1

Two small spheres of masses M₁. and M₂ are suspended by weightless insulating threads of lengths L₁ and L₂. The spheres carry charges Q₁ and Q₂ respectively. The spheres are suspended such that they are in level with one another and the threads are inclined to the vertical at angles of θ₁ and θ₂ as shown. Which one of the following conditions is essential, if θ₁= θ₂

A
M₁ ≠ M₂ but Q₁ = Q₂

B
M₁ = M₂

C
Q₁ = Q₂

D
L₁ = L₂

Solution
Question 4
4 / -1

A ball with charge –50 e is placed at the centre of a hollow spherical shell which has a net charge of –50 e. What is the charge on the shell\'s outer surface?

A
–50 e

B
Zero

C
–100 e

D
+100 e

Solution
Question 5
4 / -1

Two charged spherical conductors of radii R₁. and R₂ are connected by a wire. Then, the ratio of surface charge densities of the spheres σ₁/ σ₂ is

A

B

C

D

Solution
Question 6
4 / -1

A conductor has been given a charge –3 × 10^–7 C by transferring electron. Mass increase (in kg) of the conductor and the number of electrons added to the conductor are respectively

A
2 × 10^–16 and 2 × 10³¹

B
5 × 10^–31 and 5 × 10¹⁹

C
3 × 10^–19 and 9 × 10¹⁶

D
2 × 10^–18 and 2 × 10¹²

Solution
Question 7
4 / -1

A ring of radius r carries a charge Q uniformly distributed over its length. A charge q is placed at its centre will experience a force equal to

A

B

C
Zero

D
None of these

Solution
Question 8
4 / -1

A
0

B

C

D

Solution
Question 9
4 / -1

Two points P and Q are maintained at the potentials of 10 V and –4V respectively. The work done in moving 100 electrons from P to Q is

A
–9.60 × 10^–17 J

B
9.60 × 10^–17 J

C
–2.24 × 10^–16 J

D
2.24 × 10^–16 J

Solution
Question 10
4 / -1

Two charged spheres of radii 10 cm and 15 cm are connected by a thin wire. No charge will flow, if they have

A
The same charge on each

B
The same potential

C
The same energy

D
The same field on their surfaces