calculate the time taken by a spherical ball if the direction of electric field is reversed and the charge on the particle is changed to `+3.5xx10^(-19)` C

Explanation

To solve the problem of calculating the time taken by a spherical ball when the direction of the electric field is reversed and the charge on the particle is changed to \( +3.5 \times 10^{-19} \) C, we can follow these steps:

### Step 1: Understand the Problem
We need to find the time taken for a spherical ball with a charge of \( +3.5 \times 10^{-19} \) C to move in an electric field. The direction of the electric field has been reversed, which will affect the force acting on the charged ball.

### Step 2: Determine the Force on the Ball
The force \( F \) acting on a charged particle in an electric field \( E \) is given by:
\[
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