Tag: introduction to electrostatic force

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

Which is not an electrostatic phenomenon

  1. Comb rubbed with hair attracts paper bits

  2. A blanket in winters in dark when scrambled gives electrical sparks

  3. Two people shaking hands feel a small spark in winters

  4. Heat is generated in a resistor carrying current
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

(d) is based on Joule's Law.

Rest are electrostatic phenomenon.

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

What is known as electrostatic attraction?

  1. When negatively charged atom is attracted towards positively charged atom

  2. When positively charged atom is attracted towards negatively charged atom

  3. When positively charged atom is attracted towards positively charged atom

  4. When negatively charged atom is attracted towards negatively charged atom
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When negatively charged atom is attracted towards positively charged atom, it is known as electrostatic attraction.


Option A is correct.

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

What is known as electrostatic repulsion?

  1. When two positively or two negatively charged electrons come closer to each other then they repel from each other

  2. When two charged electrons come closer to each other then they repel from each other

  3. When positively and negatively charged electrons come closer to each other then they repel from each other

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

When two positively or two negatively charged electrons come closer to each other then they repel from each other. Then it is known as electrostatic repulsion.


Option A is correct.

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

The law that describes the force as directly proportional to magnitude of charges and inversely proportional to the distance between the charges is known as :

  1. Newton's law

  2. Coulomb's law

  3. Gauss's law

  4. Ohm's law
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Newton's law : force $F=ma$  where m=mass and a=acceleration

Coulomb's law : force $F=\dfrac{kq _1q _2}{r^2}$ where $q _1, q _2 $ are charges and $r=$ separation of charges and $k=$ proportionality constant.
Gauss's law : the electric flux $\phi=\dfrac{q}{\epsilon _0}$ 
Ohm's law : Potential across a wire of resistance R is $V=IR$ where I is the current. 

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 $r _{12}^2$.