Properties of Charges

Q. The rate of flow of electric charges is called electric potential.

1. True
2. False

Q. Inflate two balloons and rub both of them with a cloth first and then with different materials. Will they attract each other in both cases?

Q.

An ebonite rod rubbed with fur is brought near a piece of silk rubbed with a glass rod. What will you observe?

1. Attraction

2. Repulsion

3. No visible change

4. First attraction, then repulsion

Q.

When a glass rod rubbed with silk and an ebonite rod rubbed with fur are suspended by silk threads near each other but do not touch each other, the rods attract each other because like charges repel and unlike charges attract each other.

1. True
2. False

Q. What is photon

Q. Explain the principle of gold-leaf electroscope with a schematic diagram.

Q. Who invented lightning conductor?

Q. An uncharged electroscope can be charged by holding a charged body near its cap. True/False?

Q. A glass rod rubbed with silk is brought near the fur rubbed with an ebonite rod. Write your observation.

Q.

Two metal balls are suspended as shown in the figure. A glass rod is rubbed with silk to charge it. Now, touch both the balls with the glass rod. What is the observation that can be noted?

1. The balls get attracted to each other

2. The balls get repelled from each other

3. Can't say

4. No attraction or repulsion is seen

Q. Q.43. Electric potential is ________ quantity.
(A) Scalar
(B) Vector
(C) Neither Scalar nor Vector
(D) Both A and B

Q. An inflated balloon is rubbed with a woollen cloth and in another case, a ballpen refill is rubbed with polythene.
When the balloon and refill are brought closer, it is observed that they attract each other. What can we understand by this?

Q. Write the SI unit of charge.

Q.

Suspend two plastic balls as shown in the figure. A glass rod is rubbed with silk to make it charged. One of the balls is touched with the glass rod and the other is touched with the silk.What can we observe? Give reason for the observation. [3 MARKS]

Q. A particle deflects towards negative plate in the presence the electric field. Identify the particle?

1. Electron
2. Neutron
3. X-ray
4. Proton

Q. The uncertainity in momentum of an electron is $1\times {10}^{-5}kg.m/s$. The uncertainity in its position will be ($h$ = $6.62\times {10}^{-34}kg.m/s$)

1. $5.27\times {10}^{-30}m$

2. $5.27\times {10}^{-28}m$

3. $1.05\times {10}^{-28}m$

4. $1.05\times {10}^{-26}m$

Q.

Five Styrofoam balls A, B, C, D, and E are used in an experiment. The following observations were made in this experiment :

I. Ball A repels C and attracts B.

II. Ball D attracts B and has no effect on E.

III. A negatively charged rod attracts both A and E.

Based on the above information, answer the following questions:

The ball E must be

1. Positively charged

2. Negatively charged

3. Neutral

4. Cant say

Q. Two metal balls are suspended, as shown in the figure.​ A glass rod is rubbed with silk to make it charged. Now, both the balls are individually touched with this glass rod. What would we observe?​

Q. Two objects when rubbed together get charged. The charges on them are

1. A
2. B
3. C
4. D