Electrostatics Test

Result

Electrostatics Test - 120

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Question 1
4 / -1

A parallel plate air capacitor is capacitor to a potential difference of V. After disconnecting the battery, distance between the plates of the capacitor is increased using an insulating handle. As a result, the potential difference between the plates

A
Decreases

B
Increases

C
Become zero

D
Does not change

Solution
Question 2
4 / -1

A 10pF capacitor is connected to a 50 V battery. How much electrostatic energy is stored in the capacitor?

A
1.25 × 10^–8 J

B
2.5 × 10^–7 J

C
3.5 × 10^–5 J

D
4.5 × 10^–2J

Solution
Question 3
4 / -1

If a slab of insulating material 4 × 10^–3m thick is introduced between the plates of a parallel plate capacitor, the separation between plates has to be increased by 3.5 × 10^–3m to restore the capacity to original value. The dielectric constant of the material will be

A
6

B
8

C
10

D
12

Solution
Question 4
4 / -1

When a dielectric material is introduced between the plates of a charged condenser then electric field between the plates

A
Decreases

B
Increases

C
Remain constant

D
First (b) then (a)

Solution
Question 5
4 / -1

A 40µF capacitor in a defibrillator is charge to 3000.V The energy stored in the capacitor is sent through the patient during a pulse of duration 2 ms. The power delivered to the patient is

A
45 kW

B
90 kW

C
180 kW

D
360 kW

Solution
Question 6
4 / -1

Two metallic spheres of radii 1 cm and 2 cm are given charges 10^–2 C and 5 × 10^–2 C respectively. If they are connected by a conducting wire, the final charged onthe smaller sphere is

A
3 × 10^–2 C

B
1 × 10^–2 C

C
4 × 10^–2 C

D
2 × 10^–2 C

Solution
Question 7
4 / -1

The capacity of a parallel plate condenser is 15µF, when the distance between its plates is 6 cm. If the distance between the plates is reduced to 2 cm, then the capacity of this parallel plate condenser will be

A
15µF

B
30µF

C
45µF

D
60µF

Solution
Question 8
4 / -1

When we touch the terminals of a high voltage capacitor, even after a high voltage been cut off, then the capacitor has a tendency to

A
Restore energy

B
Discharge energy

C
Affect dangerously

D
Both (b) and (c)
Question 9
4 / -1

What is the value of capacitance if the thin metallic plate is introduced between two parallel plated of area A and separated at distance d?

A

B

C

D
Question 10
4 / -1

The capacity of a parallel plate capacitor with no dielectric substance but with a separation of 0.4 cm is 2µF. The separation is reduced to half and it is filled with a dielectric substance of value 2.8. The final capacity of the capacitor is

A
11.2µF

B
15.6µF

C
19.2µF

D
22.4µF

Solution