Charged Objects

Q.

What is a positive or negative charges?

Q. What happens when two different neutral bodies are rubbed against each other?

1. They acquire different charges but in different amounts depending upon their masses.
2. They do not acquire any charge.
3. They acquire equal and similar charges.
4. They acquire equal and opposite charges.

Q.

Why does a plastic comb rubbed with dry hair attract tiny pieces of paper ?Please provide diagram or animation

Q.

Explain how the atom is neutral as a whole?

Q. A device that can be used to test whether an object is carrying a charge or not, is known as an .

1. electrometer
2. electroscope
3. electroplate
4. electrolyte

Q. When we take a charged comb and take it near a stream of flowing water falling from a tap, it is observed that the water is bending towards the comb. Which of the following can be the reason for it?

1. Magnetic attraction by charged comb.
2. Electrostatic discharge from the tap.
3. Water flowing under gravity acquires magnetic properties.
4. Electrostatic force between comb and water stream.

Q.

If you rub a metal comb in your hair it does not get charged why

Q. Tiny bits of paper are a charged comb. Charges develop in the paper pieces because of .

1. attracted towards
2. repelled away from
3. induction
4. friction

Q. Electroscope is used:

1. to detect and test small electric charges.
2. to calculate the amount of electric charge flowing through the conductor.
3. to find out the presence of antimatter.
4. to test the presence of lightning.

Q. On rubbing silk with glass why do the electrons transfer only from glass to silk? Why not from silk to glass?

Q.

Electric charges that do not move are called _______ .

Q. Why do unlike charges attract and like charges repel?

Q.

Transferring a charge by touching is called charging by

1. Conduction

2. Induction

3. Convection

4. Radiation

Q.

Take a used ballpen refill and rub it vigorously with a piece of polythene. What happens when we bring the refill close to small pieces of paper. Give a reason for this.
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Q. How a charge body can attract a uncharged body.?explain briefly.

Q. When a piece of plastic becomes positively charged it has:

1. Lost electrons
2. Gained electrons
3. Gained protons
4. Lost protons

Q. Is there loss of charge in conducttion or induction?

Q.

What is the reason for two uncharged bodies to get charged on rubbing?

Q. On rubbing a glass rod with a silk cloth why is it that the glass rod will acquire positive charge whereas the silk cloth gets negative charge and not the other way round , why can't the glass rod get negatively charged and the silk cloth positively charged ?

Q.

What are the two kind of charges?

Q. Two spherical conductors b and c having equal radii carrying equal charge repel each other with a force F when kept apart a distance . A third indemnify c spherical conductor initially in charged is brought in contact with b and with c and finally removed. Find the new force of repulsion between b and c

Q.

A moving charge produces

1. Only magnetic field

2. Only electric field

3. Both magnetic field and electric field

4. None of these

Q. Electrostatics deals with the study of moving charges.

1. False
2. True

Q.

Name three constituents of an atom and state the kind of charge on each of them.

Q.

When two charged glass rods, after being rubbed with a silk cloth are brought towards each other, they ___.

1. neither attract nor repel

2. cannot be determined

3. attract each other

4. repel each other

Q.

Can rubbing cause static electricity?

Q.

Define the term proton.

Q.

Name three most important subatomic particles present in the nucleus of an atom.

Q.

What does electric charge mean?

Q.

I rub a straw with a sheet of paper and it becomes a charged body and attracts an uncharged body.

How and why does a uncharged body become a charged body? Please explain the concept of charged and uncharged bodies.