An electron falls through a small distance in a uniform electric field of magnitude `2xx10^(4)NC^(-1)`. The direction of the field reversed keeping the magnitude unchanged and a proton falls through the same distance. The time of fall will be

Explanation

To solve the problem of how long it takes for an electron and a proton to fall through the same distance in a uniform electric field, we can follow these steps:

### Step 1: Understand the forces acting on the electron and proton
- For the electron, the electric force acts upward (opposite to the direction of the electric field) because it has a negative charge. The weight of the electron acts downward.
- For the proton, both the weight and the electric force act downward (since it has a positive charge and the electric field is downward).

### Step 2: Calculate the forces acting on the electron and proton
- The force acting on the electron (F_e) is given by:
...