Tag: electric charges and fields

Questions Related to electric charges and fields

If a body acquires electric charge temporarily under the influence of charged body, then the process is called:

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

  1. conduction

  2. induction

  3. radiation

  4. dispersion

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Correct Option: B
Explanation:

Induction. 
Induction is the process by which an electrical effect id produced by an electrical conductor when it is exposed to the the influence of field of force.

The process of charging a conductor from a charged body without touching them together is called induction

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

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

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Correct Option: A
Explanation:

Answer is A.

Electrostatic induction is a redistribution of electrical charge in an object, caused by the 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 the other end.
Hence, the statement is true. 

What happens when two straws are individually rubbed with separate sheets of paper and are brought near to each other?

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

  1. The straws attract each other

  2. The straws repel each other

  3. The straws remain indifferent of each other

  4. Either A or B

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Correct Option: B
Explanation:

It is because both the object are rubbed with a sheet of paper and they acquires same charges so they repels each other. 

What happens when a charged balloon is placed near another balloon of the same charge?

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

  1. Attract each other

  2. Repel each other

  3. Neither attract nor repel

  4. All of the above

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Correct Option: B
Explanation:

Both the balloons are charged and having same charge,  therefore they will repel each other. 

When the ebonite rod is rubbed with fur, the charge acquired by the fur is:

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

  1. negative

  2. positive

  3. both positive and negative

  4. none of these

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Correct Option: B

Electrostatic induction is used to charge

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

  1. Conductors

  2. Semiconductors

  3. Insulators

  4. All of the above

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Correct Option: A
Explanation:
The presence of electric charges on the insulator and the electric charges on the insulator and the electric forces they apply to the conduction electrons - creates or induces, the dipole in the conductor. This produces electrostatic charge on conductors.

Two bodies are changed by rubbing one against the other. During the process, one becomes positively charged while the other becomes negatively charged. Then,

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

  1. mass of each body remains unchanged.

  2. mass of each body changes marginally.

  3. mass of each body changes slightly and hence the total mass.

  4. mass of each body changes slightly but the total mass remains the same.

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Correct Option: D
Explanation:
The transfer of electrons from one body to the result in redistribution of charges.
Hence, no. of electrons given by one body $=$ Number of electrons obtained by the other.
$\therefore$ Mass of negatively charged body slightly increases.
Whereas the total mass of the system remain the same.

Which of the following statement is NOT true?

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

  1. Lightning and spark from woolen clothing are essentially the same phenomena.

  2. When you rub a plastic scale on your dry hair, it acquires a charge.

  3. Charge acquired by a glass rod when it is rubbed with silk is negative charge.

  4. Static charges are called so, because they do not move by themselves.

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Correct Option: C
Explanation:

Benjamin Franklin showed for the first time that lightning and spark from our clothes are essentially the same phenomena.

When a plastic scale is rubbed with dry hair, it acquires a small charge. These objects are called charged objects. In the process of charging the plastic scale hair also get charged.
When you are rubbing the glass rod with the silk cloth, electrons are stripped away from the atoms in the glass and transferred to the silk cloth. This leaves the glass rod with more positive than negative charge, so you get a net positive charge.

A glass rod is rubbed with silk, is found positively charged. This is because.

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

  1. Electrons are transferred from glass rod to silk.

  2. Electrons are transferred from silk to glass rod.

  3. Protons are transferred from glass rod to silk.

  4. Protons are transferred from silk to glass rod.

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Correct Option: A
Explanation:

When you are rubbing the glass rod with silk cloth, electrons are stripped away from the atoms in the glass and transferred to the silk cloth.

Hence, option A is correct.

When a piece of polythene is rubbed with wool, a charge of $-2\times 10^{-7}C$ is developed on polythene. What is the amount of mass, which is transfered to polythene.

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

  1. $11.48\times 10^{19}kg$

  2. $11.58\times 10^{-19}kg$

  3. $11.68\times 10^{-19}kg$

  4. $11.38\times 10^{-19}kg$

Show answer
Correct Option: C