Tag: introduction to electrostatics

Questions Related to introduction to electrostatics

State whether true or false.
Copper is a poor conductor of electricity as compared to glass.

physics electric charges and fields conductors and insulators introduction to electrostatics electricity

  1. True

  2. False

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Correct Option: B
Explanation:

The given statement is false because copper is not a good conductor of electricity as compared to glass, The reason is that glass is usually an insulator and have electrons held tightly which means they aren't shared between other atoms, so it is a poor conductor of electricity whereas copper is a metal and has free electrons in it and therefore is good conductor of electricity.

State whether true or false.
Pure water is a good conductor of electricity.

physics electric charges and fields conductors and insulators introduction to electrostatics electricity

  1. True

  2. False

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Correct Option: B
Explanation:

The given statement is false,  because pure water is not a good conductor of electricity. Because water itself isn't a conductor. It i the presence of salts in an impure water that makes it conductive. But in pure water, it has all salts removed from it and therefore, pure water is then devoid of free ions and hence not a good conductor.

State whether the given statement is True or False :

Conductors when charged transfer all charges to the entire surface of the conductor. 

physics electric charges and fields conductors and insulators introduction to electrostatics electricity

  1. True

  2. False

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Correct Option: A
Explanation:
True.
When conductors gets charged then all the charge will be distributed to the surface of conductor.

Option A is correct.

Poor conductors of electricity is/are: 

physics electric charges and fields conductors and insulators introduction to electrostatics electricity

  1. Silver

  2. Aluminium

  3. Pure water

  4. Copper

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Correct Option: C
Explanation:
Pure water is a poor conductor since its molecules do not have free electrons to travel and thus transfer current.

Option C is correct.

In conductors electrons can flow because their

physics electric charges and fields conductors and insulators introduction to electrostatics electricity

  1. ions are free

  2. electrons are free and mobile

  3. protons are free

  4. negative ions are free

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Correct Option: B
Explanation:

In conductors electrons can flow because their because their electrons are free and mobile.


Option B is correct.

From below which is the example of insulators.

physics electric charges and fields conductors and insulators introduction to electrostatics electricity

  1. Metallic elements

  2. Non Metallic elements

  3. graphite

  4. acqueous solution of salt

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Correct Option: B
Explanation:

Metallic elements have free electrons on the metallic surface and thus they are extremely good conductors. 


Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Graphite is structured into planes with tightly bound atoms. There is a great deal of distance between planes, and they are bonded weakly together, allowing the electrons to move around.

When a salt is added in water, it dissociates into respective ions and these collect on the cathode and anodes respectively and a current is maintained. 
Hence it is a conductor.

The materials that do not allow flow of electron through them are known as :

physics electric charges and fields conductors and insulators introduction to electrostatics electricity

  1. conductors

  2. insulators

  3. semi conductors

  4. electrolytes

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Correct Option: B
Explanation:

The materials that do not allow flow of electron through them are known as Insulators.


Option B is correct.

State whether given statement is True or False :

In conductors electric current can flow freely. 

physics electric charges and fields conductors and insulators introduction to electrostatics electricity

  1. True

  2. False

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Correct Option: A
Explanation:

True

In conductors electric current can flow freely.

Option A is correct.

Until when does the charged particle transmits charge to other?

physics electric charges and fields conductors and insulators introduction to electrostatics electricity

  1. Until the overall repulsive forces between electrons is minimised.

  2. Until the overall repulsive forces between electrons is maxmised.

  3. Until the overall repulsive forces between electrons is become neutral.

  4. None

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Correct Option: A
Explanation:

Until the overall repulsive forces between electrons is minimised, the charged particle continues to transmit charge to other particles.


Option A is correct.

Electrical charge can be transferred from a charged object to another through

physics electric charges and fields conductors and insulators introduction to electrostatics electricity

  1. vacuum

  2. air

  3. insulator

  4. conductor

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Correct Option: D
Explanation:

We know that a conductor has free electrons and due to this, the conductor is able to transfer electric charge (the current).