Electrostatics Test

Result

Electrostatics Test - 61

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Question 1
4 / -1

A spherical condenser has inner and outer spheres of radii a and b 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
Question 2
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

Solution
Question 3
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
Question 4
4 / -1

The capacity of a condenser in which a dielectric of dielectric constant 5 has been used, is C. If the dielectric is replaced by another with dielectric constant 20, the capacity will become

A

B
4 C

C

D
2 C

Solution
Question 5
4 / -1

A parallel plate condenser with a dielectric of dielectric constant K between the plates has a capacity C and is charged to a potential V volts. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in this process is

A

B

C

D
Zero
Question 6
4 / -1

A charge of 10^–9C is placed on each of the 64 identical drops of radius 2 cm. They are then combined to form a bigger drop. Find its potential

A
7.2 × 10³ V

B
7.2 × 10² V

C
1.44 × 10² V

D
1.44 × 10³ V

Solution
Question 7
4 / -1

To increase the charge on the plate of a capacitor means to

A
Decrease the potential difference between the plates

B
Decrease the capacitance of the capacitor

C
Increase the capacitance of the capacitor

D
Increase the potential difference between the plates
Question 8
4 / -1

Two spherical conductors each of capacity C are charged to potentials V and –V. These are then connected by means of a fine wire. The loss of energy will be

A
Zero

B

C

D

Solution
Question 9
4 / -1

The area of the plates of a parallel plate condenser is A and the distance between the plates is 10mm. There are two dielectric sheets in it, one of dielectric constant 10 and thickness 6mm and the other of dielectric constant 5 and thickness 4mm. The capacity of the condenser is

A

B

C

D

Solution
Question 10
4 / -1

An air capacitor of capacity C =10µF is connected to a constant voltage battery of 12V. Now the space between the plates is filled with a liquid of dielectric constant 5. The charge that flows now from battery to the capacitor is

A
120µC

B
699µC

C
480µC

D
24 µC

Solution