A body is moved along a closed loop. Is the work done in moving the body necessarily zero ? If not, state the condition under which work done over a closed path is always zero.

Explanation

To solve the question, we will analyze the situation of a body moving along a closed loop and determine the conditions under which the work done is zero.

### Step-by-Step Solution:

1. **Understanding Work Done**:
Work done (W) is defined as the product of the force (F) applied on an object and the displacement (d) of that object in the direction of the force. Mathematically, it is expressed as:
\[
W = F \cdot d
...