Calculate the dimensions of (a) `int vecE .dvecl, (b)vBl and (dPhi_0)/(dt)`. The symbols have their usual meanings.

Explanation

To solve the problem of calculating the dimensions of the given expressions, we will break it down step by step.

### Step 1: Calculate the dimensions of \( \vec{E} \cdot d\vec{l} \)

1. **Identify the quantities involved**:
- \( \vec{E} \) is the electric field.
- \( d\vec{l} \) is an infinitesimal displacement vector.

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