Tag: physics

Questions Related to physics

An infinite number of charges each equal to q coulomb are placed along x-axis at x 1, x = 2, x= 8. so on the potential and electric field at x =0 due to this arrangement is

physics static electricity properties of charges charge properties of charge

  1. $\dfrac { q } { 2 \pi \varepsilon _ { 0 } } , \dfrac { 3 q } { 4 \pi \varepsilon _ { 0 } }$

  2. $\dfrac { q } { 2 \pi \varepsilon _ { 0 } } \cdot \frac { q } { 3 \pi \varepsilon _ { 0 } }$

  3. $\dfrac { 2 q } { \pi \varepsilon _ { 0 } } , \dfrac { q } { 3 \pi \varepsilon _ { 0 } }$

  4. $\dfrac { q \varepsilon _ { 0 } } { \pi 2 } , \dfrac { q E _ { 0 } } { 3 \pi }$

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Correct Option: B

The energy of thermal neutrons is

physics static electricity properties of charges charge properties of charge

  1. $< 1 \mathrm { ev }$

  2. $> 1 \mathrm { ev }$

  3. $= 2 \mathrm { Mev }$

  4. $= 4 \mathrm { Mev }$

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Correct Option: A

The sum total of the number of electrons in a system may change. The statement is :

physics static electricity properties of charges charge properties of charge

  1. true

  2. false

  3. ambiguous

  4. data insufficient

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Correct Option: A
Explanation:

The statement is true as electrons can be transferred from one body to the other,  thereby changing the number in the system.  

Quantisation of charge implies :

physics static electricity properties of charges charge properties of charge

  1. charge cannot be destroyed

  2. charge exists on particles

  3. there is a minimum permissible charge on a particle

  4. charge, which is a fraction of a charge on an electron is not possible

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Correct Option: D
Explanation:

Quantisation of Charge means that we say something has some charge , we mean by that that how many times the charge of electrons it has.  Because  whole charge is associated with an electron.

What is the amount of charge on an electron?

physics static electricity properties of charges charge properties of charge

  1. 1.6 $\times 10^{19}$ coulomb

  2. 1.6 $\times 10^{-10}$ coulomb

  3. 1.6 $\times 10^{10}$ coulomb

  4. 1.6 $\times 10^{-19}$ coulomb

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Correct Option: D
Explanation:

The charge of an electron is, $e=1.6\times { 10 }^{ -19 }C$.

What is the minimum possible amount of charge?

physics static electricity properties of charges charge properties of charge

  1. Electronic charge $e$

  2. Electronic charge $2e$

  3. Electronic charge $\dfrac{e}{2}$

  4. Electronic charge $\dfrac{e}{\sqrt{2}}$

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Correct Option: A
Explanation:

The minimum possible charge is equal to the charge of the electron.That is, $e=1.6\times { 10 }^{ -19 }C$.
The electron is a subatomic particle, symbol e, with a negative elementary electric charge. Electrons belong to the first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure.

The charge on a body is +1 C. Find the number of electrons in excess or deficit on the body.

physics static electricity properties of charges charge properties of charge

  1. 6.25 $\times 10^{1}$ coulomb

  2. 6.25 $\times 10^{-18}$ coulomb

  3. 6.25 $\times 10^{-1}$ coulomb

  4. 6.25 $\times 10^{18}$ coulomb

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Correct Option: D
Explanation:

The SI unit of electric charge is Coulomb, One coulomb is equal to about $6.242\times { 10 }^{ 18 }e$. 
One coulomb is defined as the quantity of charge which will pass through the cross section of an electrical conductor while one ampere current is flowing through the conductor in one second. Electric charge is denoted by Q.

The charge on an electron is:

physics static electricity properties of charges charge properties of charge

  1. 1 C

  2. +1.6 $\times 10^{-19}$C

  3. -1.6 $\times 10^{-19}$ C

  4. 6.25 $\times 10^{18}$C

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Correct Option: C
Explanation:

Answer is C.

Electron charge, fundamental physical constant expressing the naturally occurring unit of electric charge, equal to 1.6021765 1019 coulomb. In addition to the electron, all freely existing charged subatomic particles thus far discovered have an electric charge equal to this value or some whole-number multiple of it.
Hence, the charge of the electron is $-1.6\times { 10 }^{ -19 }C$. The negative sign is due to the negative charge of electrons.

A steady curent ‘i’ is flowing through a conductor of uniform cross-section. Any segment of the conductor has

physics static electricity properties of charges charge properties of charge

  1. zero charge

  2. only positive charge

  3. only negative charge

  4. charge proportional to current

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Correct Option: A
Explanation:

Any segment of conductor is electrically neutral.
There are fixed positive ions already present that will neutralize the negative charge of the electrons.
No segment serves as the source/sink of charge

Electric charge is due to the loss or gain of .............

physics static electricity properties of charges charge properties of charge

  1. protons

  2. neutrons

  3. electrons

  4. none of these

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Correct Option: C
Explanation:

Electric charge is due to the loss or gain of electrons.
An atom or group of atoms that have a positive or negative electric charge due to a gain (negative charge) or loss (positive charge) of one or more electrons. Atoms with a positive charge are known as cations; those with a negative charge are anions.