Tag: charging and discharging

Quizzes (0) Questions (87)

Questions Related to charging and discharging

Multiple choice physics electric fields introduction to electrostatic force electric force charging and discharging

On which factors from below does Coulomb's law(i.e. law of electrostatic attraction and repulsion) depends?

  1. Magnitude of charges

  2. Distance between charges

  3. Both magnitude and distance between charges

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

Coulomb's Law : $\dfrac{kq _1q _2}{r^2}$
It depends on both magnitude of charges and distance between them. 

Multiple choice physics electric fields introduction to electrostatic force electric force charging and discharging

Electric charges which are under the action of electric forces are known as :

  1. Electrostatic

  2. Electric flux

  3. Electric field

  4. Electric field lines
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electrostatic : when the charges are under action of electric forces. 

Electric flux : It is the measure of filed lines through a given area. 
Electric field  : the electric force per unit charge. 
Electric field lines : it measure the nature of charges, field lines is outward form positive charges and inner-ward for negative charges.

Multiple choice physics electric fields introduction to electrostatic force electric force charging and discharging

What does coulomb's law of attraction and repulsion states?

  1. F is directly proportional to $q _1q _2$ and inversely proportional to $(r _{12})^2$

  2. F is directly proportional to&nbsp;<span>$q _1q _2$</span>&nbsp;and inversely proportional to&nbsp;<span>$(r _{12})$</span>

  3. F is indirectly proportional to&nbsp;<span>$q _1q _2$</span>&nbsp;and directly proportional to <span>$(r _{12})^2$</span>

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

The Coulomb law is the force between two charges $q _1$ and $q _2$ when the separation between them is $r _{12}$. 

Here , $F=\dfrac{kq _1q _2}{r _{12}^2}$
Thus, F is proportional to $q _1q _2$ and invewrsely proportional to $r _{12}^2$.

Multiple choice physics electric fields introduction to electrostatic force electric force charging and discharging

Which of the following represents Coulomb's constant?

  1. $k\,=\,\frac{1}{4\times \pi \times e^0}$

  2. $k\,=\,1$ + ($4\times \pi \times e^0$)

  3. <span>$k\,=\,1$ - ($4\times \pi \times e^0$)</span>

  4. <span>$k\,=\,1$ * ($4\times \pi \times e^0$)</span>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

We know that Coulomb's force, $F=\frac{1}{4\pi \epsilon _0} \frac{q _1q _2}{r^2}$


The Coulomb constant will be  $k=\frac{1}{4\pi\epsilon _0}$

Multiple choice physics electric fields introduction to electrostatic force electric force charging and discharging

When we wear nylon dresses during winter then there is ______ current which gets produced due to contact with out body. Fill in the Blank.

  1. Magnetic

  2. Electrostatic

  3. Potential

  4. kinetic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When we wear nylon dresses during winter then there is electrostatic current which gets produced due to contact with out body.


Option B is correct.

Multiple choice physics electric fields introduction to electrostatic force electric force charging and discharging

When we rub our comb with hair and then take near to the paper pieces, all pieces get stuck to the comb. This happens due tyo which phenomena?

  1. Electrostatic Induction

  2. Magnetic effect

  3. Potential effect

  4. Kinetic effect
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When negative charges is created in the comb by rubbing it with hair and pieces of paper are exposed to the electric field created by the charge, the part of paper closer to the comb will be positively charged due to electromagnetic induction, and the farther would be negatively charged, causing the paper to be attracted to the comb.

Multiple choice physics electric fields introduction to electrostatic force electric force charging and discharging

The force between two bodies having charges $5C$ and $10C$ separated by distance of $0.5 m$ in air is :

  1. $18\times 10^{11}\ N$

  2. <span>$9\times 10^{11}\ N$</span>

  3. <span>$9\times 10^{9}\ N$</span>

  4. <span>$18\times 10^{9}\ N$</span>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

By Coulomb's law, the force between two charges is $F=k \dfrac{q _1q _2}{r^2}=(9\times 10^9)\times \dfrac{5\times 10}{(0.5)^2}=18\times 10^{11} N$