Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented?

Explanation

**Step-by-Step Solution:**

1. **Understanding Electrophoresis:**
- Electrophoresis is the movement of colloidal particles under the influence of an applied electric field. This movement occurs due to the charge on the particles, which causes them to migrate towards the electrode of opposite charge.

2. **Application of Electric Field:**
- When an electric field is applied to a colloidal solution, it typically causes the charged colloidal particles to move. However, if this movement is prevented, we need to consider what happens to the system.

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