Electrostatics Test

Result

Electrostatics Test - 91

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Weekly Quiz Competition

Question 1
4 / -1

Charge on α–particle is

A
4.8 × 10^–19C

B
1.6 × 10^–19C

C
3.2 × 10^–19C

D
6.4 × 10^–19 C

Solution
Question 2
4 / -1

Two small conducting spheres of equal radius have charges +10 µC and – 20 µC respectively and placed at a distance R from each other experience force F₁. If they are brought in contact and separated to the same distance, they experience force F₂ The ratio F₁ to F₂ is

A
1 : 8

B
–8 : 1

C
1 : 2

D
–2 : 1

Solution
Question 3
4 / -1

Two charges each equal to 2 µC are 0.5m apart. If both of them exist inside vacuum, then the force betweenthem is

A
1.89 N

B
2.44 N

C
0.144 N

D
3.144 N

Solution
Question 4
4 / -1

A solid conducting sphere of radius a has a net positive charge 2Q conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere and has a net charge –Q. The surface charge density on the inner and outer surfaces of the spherical shell will be

A

B

C

D
None of these

Solution
Question 5
4 / -1

Three charges each of magnitude q are placed at the corners of an equilateral triangle, the electrostatic force on the charge placed at the center is (each side of triangle is L)

A
Zero

B

C

D

Solution
Question 6
4 / -1

Three charges are placed at the vertices of an equilateral triangle of side \'a\' as shown in the following figure. The force experienced by the charge placed atthe vertex A in a direction normal to BC is

A

B

C
Zero

D

Solution
Question 7
4 / -1

A

B

C

D

Solution
Question 8
4 / -1

A body has –80 micro coulomb of charge. Number ofadditional electrons in it will be

A
8 × 10^–5

B
80 × 10^–17

C
5 × 10¹⁴

D
1.28 × 10^–17

Solution
Question 9
4 / -1

Two point charges placed at a certain distance r in air exert a force F on each other. Then the distance r\' at which these charges will exert the same force in a medium of dielectric constant k is given by

A
r

B

C

D

Solution
Question 10
4 / -1

Dielectric constant for metal is

A
Zero

B
Infinite

C
1

D
Greater than 1

Solution