There is one horizontal non-conducting surface with surface charge density `5 muC//m^2`. A point object of mass `100mug` is placed above it . What charge should be given to the point object so that it may stay in equilibrium against gravity ?

Explanation

To solve the problem step by step, we will determine the charge that needs to be given to the point object so that it remains in equilibrium against gravity.

### Step 1: Understand the forces acting on the point object
The point object experiences two forces:
1. The gravitational force acting downwards, \( F_g = mg \)
2. The electric force acting upwards due to the electric field created by the charged surface, \( F_e = qE \)

### Step 2: Set up the equilibrium condition
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