Question

3. Two charges each of charge + 10uc are kept
on Y-axis at y = -a and y = +a espectively
Another point charge -20uc is placed at the
origin and given a small displacement x(x<<a)
along X-axis. The force acting on the point charge is .​

Answer 1

Answer:

Let:

Mass of the earth = M

Radius of the earth = R

Universal constant = G

Mass of a certain object = m

From Newton's law of universal gravitation.

When the object is on earth's surface, the gravie force exerted on it is given by

F = GMm/R^2________________(1)

The weight of the object on earth surface is given by

W = mg = 9.8*m___________(2)

Since the weight of a body is a measure of the gravitational influence on it. We can then equate (1) and (2)

GMm/R^2 = 9.8*m

GM = 9.8R^2____________(3)