Electrostatics Test

Result

Electrostatics Test - 56

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Weekly Quiz Competition

Question 1
4 / -1

The potential energy of a charged parallel plate capacitor is U₀, if a slab of dielectric constant k is inserted between the plates, then the new potential energy will be

A

B

C

D

Solution
Question 2
4 / -1

The energy of a charged capacitor is given by the expression (q = charge on the conductor and C = its capacity)

A

B

C

D

Solution
Question 3
4 / -1

In a charged capacitor, the energy resides

A
The positive charges

B
Both the positive and negative charges

C
The field between the plates

D
Around the edge of the capacitor plates
Question 4
4 / -1

If the circumference of a sphere is 2m, then capacitance of sphere in water would be

A
2700 pF

B
2760 pF

C
2780 pF

D
2800 pF

Solution
Question 5
4 / -1

If the charge on a capacitor is increased by 2 coulomb, the energy stored in it increase by 21%. The original charge on the capacitor is

A
10 C

B
20 C

C
30 C

D
40 C

Solution
Question 6
4 / -1

The potential gradient at which the dielectric of a condenser just gets punctured is called

A
Dielectric constant

B
Dielectric strength

C
Dielectric resistance

D
Dielectric number
Question 7
4 / -1

A parallel plate condenser has a capacitance 50µF in air and 110µF when immersed in an oil. The dielectric constant \'k\' of the oil is

A
0.45

B
0.55

C
1.10

D
2.20

Solution
Question 8
4 / -1

The potential to which a conductor is raised, depends on

A
The amount of charge

B
Geometry and size of the conductor

C
Both (a) and (b)

D
None of the above
Question 9
4 / -1

A parallel plate capacitor with air between the plates has a capacitance of 9 pF. The separation between its plates is ‘d’. The space between the plates is now filled with two dielectrics. One of the dielectrics has dielectric constant k₁ = 3 and thickness d/3 while the other one has dielectric constant k₂ = 6 and thickness 2d/3. Capacitance of the capacitor is now

A
45 pF

B
40.5 pF

C
20.25 pF

D
1.8 pF

Solution
Question 10
4 / -1

1000 small water drops each of radius r and charge q coalesce together to form one spherical drop. The potential of the big drop is larger than that of the smaller drop by a factor of

A
1000

B
100

C
10

D
1

Solution