Two charges ` Q_1 and Q_2 ` are separated by distance r. Under what conditions will the electric field be zero on the line joining them (i) between the charges (ii) outside the charge?

Explanation

To solve the problem of determining the conditions under which the electric field is zero on the line joining two charges \( Q_1 \) and \( Q_2 \), we will analyze two scenarios: (i) when the point is located between the charges and (ii) when the point is located outside the charges.

### Step-by-Step Solution

#### (i) Condition for Electric Field to be Zero Between the Charges

1. **Understanding the Setup**:
- We have two charges \( Q_1 \) and \( Q_2 \) separated by a distance \( r \).
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