Electrostatics Test

Result

Electrostatics Test - 34

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Question 1
4 / -1

Two copper balls, each weighting 10 g are kept in air 10 cm apart. If one electron from every 10⁶ atoms is transferred from one ball to the other, the coulomb force between them is (atomic weight of copper is 63.5)

A
2.0 × 10¹⁰N

B
2.0 × 10⁴N

C
2.0 × 10⁸N

D
2.0 × 10⁶N

Solution
Question 2
4 / -1

A solid conducting sphere of radius a has a net positive charge 2Q. A 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 the above

Solution
Question 3
4 / -1

Two charges placed in air repel each other by a force of 10^–4 N. When oil is introduced between the charges, the force becomes 2.5 × 10^–5N. The dielectric constant of oil is

A
2.5

B
0.25

C
2.0

D
4.0

Solution
Question 4
4 / -1

Two particle of equal mass m and charge q are placed at a distance of 16 cm. They do not experience any force. The value of is q/m is

A
1

B

C

D

Solution
Question 5
4 / -1

When a glass rod is rubbed with silk, it

A
Gains electrons from silk

B
Gives electrons to silk

C
Gains protons from silk

D
Gives protons to silk
Question 6
4 / -1

Dielectric constant for metal is

A
Zero

B
Infinite

C
1

D
Greater than 1

Solution
Question 7
4 / -1

A charge of Q coulomb is placed on a solid piece of metal of irregular shape. The charge will distribute itself

A
Uniformly in the metal object

B
Uniformly on the surface on the object

C
Such that the potential energy of the system is minimized

D
Such that the total heat loss is minimized
Question 8
4 / -1

Two identical conductors of copper and aluminum are placed in an identical electric fields. The magnitude of induced charge in the aluminum will be

A
Zero

B
Greater than in copper

C
Equal to that in copper

D
Less than in copper
Question 9
4 / -1

Two spherical conductors B and C having equal radii and carrying equal charges in them repel each other with a force F when kept apart at some distance. A third spherical conductor having same radius as that of B but uncharged is brought in contact with B but uncharged is brought in contact with B, then brought in contact with C and finally removed away from both. The new force of repulsion between B and C is

A
F/4

B
3F/4

C
F/8

D
3F/8

Solution
Question 10
4 / -1

When a body is earth connected, electrons from the earth flow into the body. This means the body is

A
Unchanged

B
Charged positively

C
Charged negatively

D
An insulator

Solution