Question

Electromagnetic force is stronger than gravitational force by a factor of.


pls answer it with reason

Answer 1

Gravitation "rules" the movements of celestial bodies because of the distance.
Magnetism is indeed stronger than gravity, just hold a bar magnet over a pin and the pin will rise against the direction of gravity.  But, the magnet can only do that over very short range, a centimeter or so.  

Newton discovered that gravity is universal, "Every mass in the entire universe is attracted to every other mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them."  That means that even though gravity gets weaker with distance, it never goes away completely. A magnetic field has an edge, it's not infinite.

The force of a magnet is complicated to figure, but the classic formula is:




Compare that to the formula for the force of gravity:



As you can see, the distance part, the part on the bottom, is bigger for magnets than for gravity.  Dividing by a larger number means the result is smaller; in this case much smaller.

So, magnetism is stronger than gravity up close. Gravity is stronger than magnetism further away (and planetary distance is very far away).