Electrostatics Test

Result

Electrostatics Test - 121

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Question 1
4 / -1

Two insulated metallic spheres of 3µF and 5µF capacitances are charged to 300V and 500V respectively. The energy loss, when they connected by a wire is

A
0.012 J

B
0.0218 J

C
0.0375 J

D
3.75 J

Solution
Question 2
4 / -1

A body of capacity 4µF is charged to 80 V and another body of capacity 6µF is charged to 30 V. When they are connected the energy lost by 4µF capacitor is

A
7.8 mJ

B
4.6 mJ

C
3.2 mJ

D
2.5 mJ

Solution
Question 3
4 / -1

Two spherical conductors A and B of radius a andb (b >a) are placed in air concentrically B isgiven charge +Q coulomb and A is grounded. The equivalent capacitance of these is

A

B

C

D
Question 4
4 / -1

A charge of 40µC is given to a capacitor having capacitance (C = 10µF) The stored energy is ergs is

A
8 × 10^–6

B
800

C
80

D
8000

Solution
Question 5
4 / -1

The electric field between the plates of a parallel plate capacitor when connected to a certain battery is E₀. If the space between the plates of the capacitor is filled by introducing a material of dielectric constant K without disturbing the battery connections, the field between the plates shall be

A
KE₀

B
E₀

C

D
None of the above

Solution
Question 6
4 / -1

If the distance between parallel plates of a capacitor is halved and dielectric constant is doubled then the capacitance

A
Decreases two times

B
Increases two times

C
Increases four times

D
Remains the same

Solution
Question 7
4 / -1

Putting a dielectric substance between two plates of condenser, capacity, potential and potential energy respectively

A
Increase, decrease, decrease

B
Decrease, increase, increase

C
Increase, increase, increase

D
Decrease, decrease, decrease
Question 8
4 / -1

A conducting sphere of radius 10 cm is charged 10µC. Another uncharged sphere of radius 20 cm is allowed to touch it for some time. After that if the sphere are separated, then surface density of charges, on thespheres will be in the ration of

A
1 : 4

B
1 : 3

C
2 : 1

D
1 : 1

Solution
Question 9
4 / -1

Capacitance (in F) of a spherical conductor with radius1 m is

A
1.1 × 10^–10

B
10^–6

C
9 × 10^–9

D
10^–3

Solution
Question 10
4 / -1

On increasing the plate separation of a charged condenser, the energy

A
Increases

B
Decreases

C
Remains unchanged

D
Becomes zero

Solution