# GENERAL KNOWLEDGE

## GK

### PHYSICS

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A 5 C and 8 C charge give off a force of 2.5 x 109 N. What is the distance between them?
 A 11 m B 12 m C 121 m D 144 m
Explanation:

Detailed explanation-1: -Coulomb’s law calculates the magnitude of the force F between two point charges, q1 and q2, separated by a distance r. F=k|q1q2|r2. k=8.988×109N⋅m2C2≈8.99×109N⋅m2C2.

Detailed explanation-2: -In Coulomb’s Law, the distance between charges appears in the equation as 1 / r 2 1/r^2 1/r21, slash, r, squared. That makes Coulomb’s Law an example of an inverse square law.

Detailed explanation-3: -What is Coulomb’s Law? According to Coulomb’s law, the force of attraction or repulsion between two charged bodies is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

Detailed explanation-4: -The force on the charge is given by F = qE, the same way the force on the mass m is given by F = mg.

There is 1 question to complete.