A particle having a charge of `2.0xx10^(-4) C` is placed directly below and at a separtion of 10 cm from the bob of a simple pendulum at rest. The mass of the bob is 100g. What charge should the bob be given so that the string becomes loose?

Explanation

To solve the problem, we need to determine the charge that should be given to the bob of the pendulum so that the tension in the string becomes zero. This means that the gravitational force acting on the bob must be balanced by the electrostatic force due to the charge placed below it.

### Step-by-Step Solution:

1. **Identify the Forces Acting on the Bob:**
- The gravitational force acting on the bob (downward) is given by:
\[
F_g = m \cdot g
...