Electrostatics Test

Result

Electrostatics Test - 92

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Weekly Quiz Competition

Question 1
4 / -1

A charge 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 of the object

C
Such that the potential energy of the System is minimized

D
Such that the total heat loss is minimized
Question 2
4 / -1

Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4) and (4,1) show electrostatic attraction, while pair (2, 3) and (4, 5) show repulsion.Therefore ball 1 must be

A
Positively charged

B
Negatively charged

C
Neutral

D
Made of metal
Question 3
4 / -1

Equal charges q are placed at the four corners A, B, C ,D of a square of length a. The magnitude of the force onthe charge at B will be

A

B

C

D

Solution
Question 4
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 5
4 / -1

The ratio of electrostatic and gravitational forces acting between electron and proton separated by a distance 5 × 10^–11m, will be (Charge on electron = 1.6 × 10^–19 C, mass of electron = 9.1 × 10^–31 kg, mass of proton = 1.6 × 10^–27 kg, G = 6.7 × 10^–11 Nm² / kg²

A
2.36 × 10³⁹

B
2.36 × 10⁴⁰

C
2.34 ×10⁴¹

D
2.34 × 10⁴²

Solution
Question 6
4 / -1

Two identical spheres carrying charges –9µC and 5µC respectively are kept in contact and then separated from each other. Point out true statement from the following. In each sphere

A
1.25 × 10¹³ electrons are in deficit

B
1.25 × 10¹³ electrons are in excess

C
2.15 × 10¹³ electrons are in excess

D
2.25 × 10¹³ electrons are in deficit

Solution
Question 7
4 / -1

Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is

A
F / 8

B
F / 4

C
4F

D
F / 16

Solution
Question 8
4 / -1

Four metal conductors having different shapes
1. A sphere
2. Cylindrical
3. Pear
4. Lightning conductor
are mounted on insulating stands and charged. The one which is best suited to retain the charges for a longer time is

A
1

B
2

C
3

D
4
Question 9
4 / -1

Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, the number of electrons missing from each ion will be (e being the charge on an electron)

A

B

C

D

Solution
Question 10
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