Which of the following is not true about electric charge ?

Options

A. Charge on a body is always integral multiple of certain charge known as charge of electron
B. Charge is a scalar quantity
C. Net charge o an isolated system is always conserved
D. Charge can be converted intto energy and energy can be converted into charge

Answer

To determine which statement about electric charge is not true, we will analyze each option provided.

### Step-by-Step Solution:

1. **Analyze Option 1**:
- Statement: "Charge on a body is always an integral multiple of a certain charge known as the charge of an electron."
- Explanation: This statement refers to the quantization of charge, which states that electric charge can only exist in discrete amounts, specifically as integer multiples of the elementary charge (the charge of an electron, approximately \(1.6 \times 10^{-19}\) Coulombs). This statement is **true**.

2. **Analyze Option 2**:
- Statement: "Charge is a scalar quantity."
- Explanation: Electric charge does not have a direction associated with it, meaning it can be added algebraically without considering direction. Therefore, charge is indeed a scalar quantity. This statement is **true**.

3. **Analyze Option 3**:
- Statement: "Net charge on an isolated system is always conserved."
- Explanation: This refers to the principle of conservation of charge, which states that the total charge in an isolated system remains constant over time. This statement is **true**.

4. **Analyze Option 4**:
- Statement: "Charge can be converted into energy and energy can be converted into charge."
- Explanation: While energy can be transformed from one form to another (as per the conservation of energy), charge itself cannot be created or destroyed; it cannot be converted into energy or vice versa. This statement is **false**.

### Conclusion:
The statement that is **not true** about electric charge is **Option 4**: "Charge can be converted into energy and energy can be converted into charge."