Electrostatics: Charging Methods

Questions and Answers

When a glass rod is rubbed with silk, what kind of charge does the glass rod acquire?

Unknown charge

Positive charge (correct)

Neutral charge

Negative charge

Friction can be used to charge conductors through rubbing.

False

What happens to the ebonite rod when it is rubbed with fur?

It becomes negatively charged.

When an uncharged metal rod touches a positively charged glass rod, it acquires a _____ charge.

positive Signup and view all the answers

Match the object with the charge it acquires after interaction:

Glass Rod with Silk = Positive Charge Ebonite Rod with Fur = Negative Charge Charged Glass Rod touching Metal Rod = Positive Charge Negatively Charged Object touching Uncharged Object = Negative Charge Signup and view all the answers

What is the name of the method used to charge a conductor by touching it with a charged object?

Charging by Conduction Signup and view all the answers

Electrons flow from a negatively charged object to an uncharged object during conduction.

True Signup and view all the answers

What charge does the uncharged metal rod acquire upon contact with the charged glass rod?

Positive charge. Signup and view all the answers

What happens to the charge distribution when a negatively charged object is brought close to a metallic sphere?

The sphere becomes positively charged on one side and negatively charged on the other. Signup and view all the answers

Electrostatic induction results in a gain or loss of total charge in the charged body.

False Signup and view all the answers

What is the main process called that induces an opposite charge on the nearer end of an uncharged conductor?

Electrostatic induction Signup and view all the answers

When side B of the metallic sphere is touched, the ______ charges flow through the body to Earth.

negative Signup and view all the answers

Match the following objects with their respective characteristics:

Conductors = Have a large number of free electrons. Insulators = Do not support electrostatic induction effectively. Negatively charged objects = Repel electrons in neighboring conductors. Electrostatic induction = Results in charge separation without loss of charge. Signup and view all the answers

Which of the following statements about electrostatic induction is true?

It involves the movement of electrons within the conductor. Signup and view all the answers

Study Notes

Charging by Friction

Only insulators can be charged through friction.
Rubbing a glass rod with silk results in:
- Glass rod becomes positively charged.
- Silk cloth becomes negatively charged.
- This occurs as free electrons migrate from the glass rod to the silk.
Rubbing an ebonite rod with fur leads to:
- Ebonite rod acquiring a negative charge.
- Fur acquiring a positive charge due to the transfer of electrons from the fur to the ebonite.

Charging a Conductor by Conduction

Conductors cannot be effectively charged by friction, as electrons can flow away.
Charging a conductor via conduction involves:
- An uncharged metal rod mounted on an insulated stand.
- A charged glass rod (positively charged after rubbing with silk) is brought into contact with the uncharged rod.
- The uncharged metal rod acquires a positive charge due to electron transfer from the rod to the glass rod.
If a negatively charged object contacts an uncharged object:
- Excess electrons flow from the negative object to the uncharged object.
- The uncharged object becomes negatively charged as a result.

Electrostatic Induction

Involves the redistribution of charges in the presence of a charged object.
Example: Bringing a negatively charged ebonite rod near a metallic sphere leads to:
- Electrons on the sphere's side A are repelled to side B.
- Side A gains a positive charge, while side B acquires a negative charge.
During electrostatic induction:
- No charges are lost or gained overall; only charge separation occurs.
If side B is touched, excess negative charges flow to the ground, leaving the sphere positively charged.
Electrostatic induction is more effective in conductors due to their abundance of free electrons, while insulators exhibit poor induction.

Description

Explore the principles of charging materials through friction and conduction in this quiz. Learn how insulators and conductors interact with electric charges and understand electron transfer through contact. Test your knowledge of electrostatic principles.