Tag: introduction to electrostatics

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

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

From below which is the example of insulators.

  1. Metallic elements

  2. Non Metallic elements

  3. graphite

  4. acqueous solution of salt
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Until when does the charged particle transmits charge to other?

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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


Option A is correct.