Electrostatics Test

Result

Electrostatics Test - 114

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Weekly Quiz Competition

Question 1
4 / -1

Eight small drops, each of radius r and having same charge q are combined to form a big drop. The ratio between the potentials of the bigger drop and the smaller drop is

A
8 : 1

B
4 : 1

C
2 : 1

D
1 : 8

Solution
Question 2
4 / -1

The capacitance of a spherical condenser is 1 µF. If the spacing between the two spheres is 1 mm then the radius of the outer sphere is

A
30 cm

B
6 m

C
5 cm

D
3 m

Solution
Question 3
4 / -1

When air in a capacitor is replaced by a medium of dielectric constant K, the capacity

A
Decreases K times

B
Increases K times

C
Increases K² times

D
Remains constant

Solution
Question 4
4 / -1

64 drops each having the capacity C and potential V are combined to form a big drop. If the charge on the smalldrop is q, then the charge on the big drop will be

A
2q

B
4q

C
16q

D
64q

Solution
Question 5
4 / -1

The capacity of a parallel plate capacitor increases with the

A
Decrease of its area

B
Increase of its distance

C
Increase of its area

D
None of the above

Solution
Question 6
4 / -1

The capacity of a spherical conductor in MKS system is

A

B

C

D

Solution
Question 7
4 / -1

Can a metal be used as a medium for dielectric

A
Yes

B
No

C
Depends on its shape

D
Depends on dielectric
Question 8
4 / -1

The capacitance C of a capacitor is

A
Independent of the charge and potential of the capacitor

B
Dependent on the charge and independent of potential

C
Independent of the geometrical configuration of the capacitor

D
Independent of the dielectric medium between the two conducting surfaces of the capacitor
Question 9
4 / -1

The respective radii of the two spheres of a spherical condenser are 12 cm and 9 cm The dielectric constant of the medium between them is 6. The capacity of the condenser will be

A
240 pF

B
240

C
240 F

D
None of these

Solution
Question 10
4 / -1

Consider a parallel plate capacitor with plates 20 cm by 20 cm and separated by 2mm. The dielectric constant of the material between the plates is 5. The plates are connected to a voltage sources of 500 V. The energy density of the field between the plates will be close to

A
2.65 J/m³

B
1.95 J/m³

C
1.38 J/m³

D
0.69 J/m³

Solution