Tag: static electricity

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Questions Related to static electricity

Multiple choice physics static electricity explaining static electricity charging by induction electric charges and fields

During a physics lab, a plastic strip was rubbed with cotton and became positively charged. The correct explanation for why the plastic strip becomes positively charged is that

  1. the plastic strip acquired extra protons from the cotton.

  2. the plastic strip acquired extra protons during the charging process.

  3. protons were created as the result of the charging process.

  4. the plastic strip lost electrons to the cotton during the charging process.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plastic strip when rubbed with cotton got charged due to charging by friction.
The plastic strip and cotton acquires opposite charges. This is because plastic strip acquires positive charges and loses electrons to cotton during the process, and therefore cotton acquires the negative charge.

Multiple choice physics static electricity explaining static electricity charging by induction electric charges and fields

During charging by friction, 

  1. charge is created.

  2. charged is destroyed.

  3. charge is conserved.

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When two objects rub each other, then due to friction, one object's electrons gets transfered to the other one.

The one which loses electrons becomes positively charged and the other, negative.
Thus charging by friction is only due to transfer of electrons. No charge gets created or destroyed in this process.

Multiple choice physics static electricity explaining static electricity charging by induction electric charges and fields

Which property of a material is paramount to it being charged by friction?

  1. electron affinity

  2. electronegativity

  3. potential difference

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electron affinity refers to the relative amount of love that a material has for electrons. If atoms of a material have high electron affinity, then that material will have relatively higher love for electrons. This property of electron affinity will be of utmost importance as we consider the common method of charging i.e, charging by friction or rubbing.

Multiple choice physics static electricity explaining static electricity charging by induction electric charges and fields

A redistribution of electrical charge in an object, caused by the influence of nearby charges is termed as

  1. electric conduction

  2. ionisation

  3. electrostatic induction

  4. electromagnetic induction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

According to the definition of electrostatic induction, it is a redistribution of electrical charge in an object, caused by influence of nearby charges. In the presence of a charged body, an insulated conductor develops a positive charge on one end and a negative charge on other end. Such charges are called induced charges and the process is called electrostatic induction. 

Multiple choice physics static electricity explaining static electricity charging by induction electric charges and fields

If the object is not grounded while performing electrostatic induction, the nearby charge will 

  1. induce equal and opposite charges in the object.

  2. induce equal charges in the object.

  3. induce opposite charges in the object.

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is one of the rule of charging by induction, that if the object is not grounded, the nearby charge will induce equal and opposite charges in the object. 

Multiple choice physics static electricity explaining static electricity charging by induction electric charges and fields

An application of electrostatic induction is

  1. electric generator

  2. Van de Graff generator

  3. Wimhurst machine

  4. transformer
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

Electrostatic induction is a redistribution of electrical charges in an object caused by the influence of nearby charges. Electrostatic generators such as the Wimshurst machine, the Vande Graph generator use this principle. 

Multiple choice physics static electricity explaining static electricity charging by induction electric charges and fields

Paper snippets attracted by a charged CD is an example of

  1. charging by induction

  2. charging by conduction

  3. charging by ionisation

  4. charging by transmission
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a charged $CD$ is brought near the paper snippets, opposite charge is induced on the paper snippets. As opposite charges attract, paper snippets are attracted by charged $CD$. So, this is an example of charging by induction. 

Multiple choice physics static electricity explaining static electricity charging by induction electric charges and fields

In charging by conduction, the charged object 

  1. ends up oppositely charged to the object used to charge it.

  2. ends up similarly charged to the object used to charge it.

  3. discharges the object used to charge it, completely.

  4. discharges the object used to charge it, to some extent.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In case of charging by conduction, when an uncharged conductor is touched with a charged conductor, the uncharged conductor acquires charge similar to charged conductor. It happens because of the electrons are shared at the point of contact of the conductors.