Electrostatics Test

Result

Electrostatics Test - 63

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Weekly Quiz Competition

Question 1
4 / -1

A parallel plate capacitor having a plate separation of 2 mm is charged by connecting it to a 300V supply. The energy density is

A
0.01J/m³

B
0.1J /m³

C
1. 0 J/m³

D
10 J/m³

Solution
Question 2
4 / -1

In a capacitor of capacitance 20µF, the distance between the plates is 2mm. If a dielectric slab of width 1mm and dielectric constant 2 is inserted between the plates, then the new capacitance is

A
2 µF

B
15.5 µF

C
26.6 µF

D
32 µF

Solution
Question 3
4 / -1

Two conducting spheres of radii 5cm and 10cm are given a charge of 15µF each. After the two spheres are joined by a conducting wire, the charge on the smaller sphere is

A
5µC

B
10µC

C
15µC

D
20µC

Solution
Question 4
4 / -1

In a parallel plate capacitor of capacitance C, a metal sheet is inserted between the plates, parallel to them. If the thickness of the sheet is half of the separation between the plates. The capacitance will be

A
C/2

B
3C/4

C
4C

D
2C

Solution
Question 5
4 / -1

While a capacitor remains connected to a battery and dielectric slab is applied between the plates, then

A
Potential difference between the plates is changed

B
Charge flows from the battery to the capacitor

C
Electric field between the plates increases

D
Energy store in the capacitor decreases
Question 6
4 / -1

The capacity of the conductor does not depend upon

A
Charge

B
Voltage

C
Nature of the material

D
All of these
Question 7
4 / -1

A solid conducting sphere of radius R₁ is surrounded by another concentric hollow conducting sphere of radius R₂. The capacitance of this assembly is proportional to

A

B

C

D

Solution
Question 8
4 / -1

The energy stored in a condenser is in the form of

A
Kinetic energy

B
Electrostatic potential energy

C
Elastic energy

D
Magnetic energy
Question 9
4 / -1

A capacitor is used to store 24 watt hour of energy at 1200 volt. What should be the capacitance of the capacitance of the capacitor

A
120 mF

B
120 µF

C
24 µF

D
24 mF

Solution
Question 10
4 / -1

The mean electric energy density between the plates of a charged capacitor is (here q = charge on the capacitor and A = area of the capacitor plate)

A

B

C

D
None of these

Solution