Question
Write a note on electromagnetic (EM) force.

Answer

Electromagnetic force:
  1. The attractive and repulsive force between electrically charged particles is called electromagnetic force.
  2. It can be attractive or repulsive.
  3. It is stronger than the gravitational force.
  4. Example: force of friction, normal reaction, tension in strings, collision forces, elastic forces, fluid friction etc. are electromagnetic in nature.
  5. Reaction forces are a result of the action of electromagnetic forces.
  6. Since majority of forces are electromagnetic in nature, our life is practically governed by these forces.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Explain: Atoms are electrically neutral.
The angular momentum $\vec{L}=\vec{r} \times \vec{p}$, where $\vec{r}$ is a position vector and $\vec{p}$ is linear momentum of a body.
If $\vec{r}=4 \vec{i} \times 6 \vec{j}-3 \hat{k}$ and $\vec{p}=2 \vec{i} \times 4 \vec{j}-5 \hat{k}$, find $\vec{L}$
The mass of a box measured by a grocer’s balance is 2.3 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is (i) the total mass of the box? (ii) the difference in the masses of the pieces to correct significant figures?
What will be the change in potential energy of a body of mass $m$ when it is placed on the surface of the Earth from height $R$ above the Earth’s surface?
Varying electric and magnetic fields regenerate each other. Explain.
A child takes reading of two cars running on highway, for his school project. He draws a position$-$time graph of the two cars as shown in the figure
Image
$i)$ What is the velocity of two cars when they meet together?
$ii)$ What is the difference in velocities of the two cars when they cover their maximum distance?
$iii)$ What will be acceleration of the two cars in first $20 s$?
A bar  magnet has magnetic moment 3.6 Am² and pole strength 10.8 Am. Determine its magnetic length and geometric length.
What are fundamental quantities? State two examples of fundamental quantities. Write their S.J. and C.G.S. units.
A metal ball falls from a height 1 m on a steel plate and jumps upto a height of 0.81 m. Find the coefficient of restitution.
For an $EM$ wave propagating along X direction, the magnetic field oscillates along the $Z-$direction at a frequency of $3 \times 10^{10} Hz$ and has amplitude of $10^{-9} T$.
$i.$ What is the wavelength of the wave?
$ii.$ Write the expression representing the corresponding electric field.