When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge.

Explanation

To explain how the observation of charges appearing on both a glass rod and a silk cloth when rubbed together is consistent with the law of conservation of charge, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Initial State of Charges**:
- Before rubbing, both the glass rod and the silk cloth are neutral. This means that the total charge on both objects is zero.
- Mathematically, we can express this as:
\[
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