Tag: introduction to electrostatic force

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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 $F=k \dfrac{q _1q _2}{r^2}=(9\times 10^9)\times \dfrac{5\times 10}{(0.5)^2}=18\times 10^{11} N$

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

The filament of an electric bulb is made of :

  1. Carbon

  2. Aluminium

  3. Tungsten

  4. Nickel
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The filament of an electric bulb is made of tungsten because it has some amazing properties including the highest melting point $(3422^oC )$, lowest vapor pressure, and greatest tensile strength out of all the metals. Because of these It can reach high temperature before melting.