Electrostatics Test

Result

Electrostatics Test - 98

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Weekly Quiz Competition

Question 1
4 / -1

Two metal pieces having a potential difference of 800V are 0.02 m apart horizontally. A particle of mass 1.96 × 10^–15 kg is suspended in equilibrium between the plates. If e is the elementary charge, then charge on the particle is

A
e

B
3e

C
6e

D
8e

Solution
Question 2
4 / -1

The figure shows some of the electric field lines corresponding to an electric fields. The figure suggests

A
E_A> E_B> E_C

B
E_A = E_B= E_C

C
E_A = E_C> E_B

D
E_A = E_C< E_B
Question 3
4 / -1

Two spheres of radii a andb respectively are charged and joined by a wire. The ration of electric field of thespheres is

A

B

C

D

Solution
Question 4
4 / -1

A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y is

A

B

C

D

Solution
Question 5
4 / -1

A hollow insulated conducting sphere is given a positive charge of 10 µC. What will be the electric field at the centre of the sphere if its radius is 2 m?

A
Zero

B
5g cm^–2

C
20g cm^–2

D
8g cm^–2
Question 6
4 / -1

An electron of mass m_e initially at rest moves through a certain distance in a uniform electric field in time t₁. A proton of mass m_p also initially at rest takes time t₂ to move thorough an equal distance in this uniform electric field. Neglecting the effect of gravity, the ratio of t₂ / t₁ is nearly equal to

A
1

B
(m_p/m_e)^1/2

C
(m_e/m_p)^1/2

D
1836

Solution
Question 7
4 / -1

A cube of side b has a charge q at each of its vertices. The electric field due to this charge distribution at the centre of this cube will be

A
q / b²

B
q / 2b²

C
32q / b²

D
1610 N / C
Question 8
4 / -1

Four charges are placed on corners of a square as shown in figure having side of 5 cm If Q is one microcoulomb, then electric field intensity at centre will be

A
1.02 × 10⁷ N/C upwards

B
2.04 × 10⁷ N/C downwards

C
2.04 × 10⁷ N/C upwards

D
1.02 × 10⁷ N/C downwards

Solution
Question 9
4 / -1

Point charge +4q, –q and +4q are kept on the x-axis at points x = 0, x = a and x = 2a respectively, then

A
Only q is in stable equilibrium

B
None of the charges are in equilibrium

C
All the charges are in unstable equilibrium

D
All the charges are is stable equilibrium
Question 10
4 / -1

If a charged spherical conductor of radius 10 cm has potential V at a point distant 5 cm from its centre, then the potential at a point distant 15 cm from the centre will be

A

B

C

D
3V

Solution