Electrostatics Test

Result

Electrostatics Test - 117

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Question 1
4 / -1

The distance between the plates of a parallel plate capacitor is d. A metal plate of thickness d / 2 is placed between the plates. The capacitance would then be

A
Unchanged

B
Halved

C
Zero

D
Doubled

Solution
Question 2
4 / -1

A capacitor is kept connected to the battery and a dielectric slab is inserted between the plates. During this process

A
No work is done

B
Work is done at the cost of the energy already stored in the capacitor before the slab is inserted

C
Work is done at the cost of the battery

D
Work is done at the cost of both the capacitor and the battery
Question 3
4 / -1

The capacitance of an air capacitor is 15µF the separation between the parallel plates is 6 mm. A copper plate of 3 mm thickness is introduced symmetrically between the plates. The capacitance now becomes

A
5µF

B
7.5µF

C
22.5µF

D
30µF

Solution
Question 4
4 / -1

An air capacitor is connected to a battery. The effect of filling the space between the plates with a dielectric is to increase

A
The charge and the potential difference

B
The potential difference and the electric field

C
The electric field and the capacitance

D
The charge and the capacitance

Solution
Question 5
4 / -1

A light bulb, a capacitor and a battery are connected together as shown here, with switch S initially open, When the switch S is closed, which one of the following is true?

A
The bulb will light up for an instant when the capacitor starts charging

B
The bulb will light up when the capacitor is fully charged

C
The bulb will not light up at all

D
The bulb will light up and go off at regular intervals
Question 6
4 / -1

The potentials of the two plates of capacitor are +10 V and –10 V. The charge on one of the plates is 40C. Thecapacitance of the capacitor is

A
2F

B
4 F

C
0.5 F

D
0.25 F

Solution
Question 7
4 / -1

The diameter of each plate of an air capacitor is 4 cm. To make the capacity of thisplate capacitor equal to that of 20 cm diameter sphere, the distance between the plates will be

A
4 × 10^–3 m

B
1 × 10^–3 m

C
1 cm

D
1 × 10^–3 cm

Solution
Question 8
4 / -1

A spherical condenser has inner and outer spheres of radii a andb respectively. The space between the two is filled with air. The difference between the capacities of two condensers formed when outer sphere is earthed and when inner sphere is earthed will be

A
Zero

B

C

D

Solution
Question 9
4 / -1

The expression for the capacity of the capacitor formed by compound dielectric placed between the plates of a parallel plate capacitor as shown in figure, will be (area of plate = A)

A

B

C

D
Question 10
4 / -1

The intensity of electric field at a point between the plates of a charged capacitor

A
Is directly proportional to the distance between the plates

B
Is inversely proportional to the distance between the plates

C
Is inversely proportional to the square of the distance between the plates

D
Does not depend upon the distance between the plates