Electrostatics Test

Result

Electrostatics Test - 99

Score
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Weekly Quiz Competition

Question 1
4 / -1

Two unlike charges of magnitude q are separated by a distance 2d. The potential at a point midway between them is

A
Zero

B

C

D

Solution
Question 2
4 / -1

What is the potential energy of the equal positive point charges of 1µC each held lm apart in air?

A
9 × 10^–3 J

B
9 × 10^–3 eV

C
2 eV/m

D
Zero

Solution
Question 3
4 / -1

An oil drop having charge 2e is kept stationary between two parallel horizontal plates 2.0 cm apart when a potential difference of 12000 volts is applied between them. If the density of oil is 900 kg/m³ , the radius of drop will be

A
2.0 × 10^–6 m

B
1.7 × 10^–6 m

C
1.4 × 10^–6 m

D
1.1 × 10^–6 m

Solution
Question 4
4 / -1

The ratio of moment of an electron and α–which are accelerated from rest by a potential difference of 100 volt is

A
1

B

C

D

Solution
Question 5
4 / -1

An electron enters between two horizontal plats separated by 2 mm and having a potential difference of 1000 V. The force on electron is

A
8 × 10^–12 N

B
8 × 10^–14 N

C
8 × 10⁹ N

D
8 × 10¹⁴ N

Solution
Question 6
4 / -1

Two metal spheres of radii R₁ and R₂ are charged to the same potential. The ratio of charges on the spheres is

A

B

C

D

Solution
Question 7
4 / -1

A
2.5 micro-coulomb

B
2.0 micro-coulomb

C
1.0 micro- coulomb

D
0.5 micro-coulomb

Solution
Question 8
4 / -1

A
9 × 10⁴ V

B
18 × 10⁴ V

C
36 × 10⁴ V

D
36 × 10^–4 V

Solution
Question 9
4 / -1

Electric field strength due to a point charge of 5µC at a distance of 80cm from the charge is

A
8 × 10⁴ N/C

B
7 × 10⁴ N/C

C
5 × 10⁴ N/C

D
4 × 10⁴ N/C

Solution
Question 10
4 / -1

Two positive point charges of 12µC and 8µC are 10 cm apart. The work done in bringing them 4 cm closer is

A
5.8 J

B
5.8 eV

C
13 J

D
13 eV

Solution