Question

prove that when two charged conductor are interconnected the distribution of charge in them is equal to the ratio of capacities????​

Answer 1

Questions Chapter 2 Electrostatic Potential and Capacitance

December 9, 2019 by Prasanna

MP Board Class 12th Physics Important Questions Chapter 2 Electrostatic Potential and Capacitance

Electrostatic Potential and Capacitance Important Questions Objective Type Questions

Question 1.

Choose the correct answer of the following:

Question 1.

The SI unit of electrical capacitance:

(a) Stat farad

(b) Farad

(c) Coulomb

(d) Stat coulomb.

Answer:

(b) Farad

Question 2.

The potential difference between the plates of a capacitor is constant. A dielectric medium is filled instead of air in between the plates. The intensity of electric field will:

(a) Decrease

(b) Remains unchanged

(c) Become zero

(d) Increase.

Answer:

(b) Remains unchanged

Question 3.

On replacing the air by an insulating material between the plates of a capacitor its capacity:

(a) Remains unchanged

(b) Increases

(c) Decreases

(d) Nothing can be said.

Answer:

(b) Increases

Answer 2

Explanation:

Energy stored in a capacitor : A capacitor is a device to store energy. The process of charging up a capacitor involves the transferring of electric charges from its one plate to another.The work done in charging the capacitor is stored as its electrical potential energy. Consider two insulated conductor A and B of capacitance C

1

,C

2

and carrying charges Q

1

and Q

2

. Let V

1

and V

2

be their respective potentials.

Q

1

=C

1

V

2

and Q

2

=C

2

V

2

If connect with wire charge flow higher to lower potential

Total charge on system Q

1

+Q

2

Total capacitance C

1

+C

2

V=

C

Q

=

C

1

+C

2

Q

1

+Q

2

=

C

1

+C

2

C

1

V

1

+C

2

V

2

V∝

C

1

+C

2

1

Electric field distance curve by uniformly charged non- conducting sphere.

E outside (r>r

0

)

E=

r

2

KQ

E inside (r<r

0

)

E=

r

0

3

KQ.r