Tag: charging and discharging

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

Sometimes you get a mild spark when you touch the metal surface of a car. What might be the reason?

  1. Due to magnetic attraction, a spark is created

  2. Due to electrostatic charge residing on the metal as well as on skin, mild spark is observed

  3. Car tries to become neutral by donating electrons

  4. Its the only path to ground
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Negative electric charge often resides on the surface of metal of car. When you touch the car, electrostatic discharge occurs via your body and you get a mild spark.

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.