Dimensional Analysis

Step 1: Identify the quantity.
Since the question is incomplete, we hypothesize that it’s asking for the dimensional formula of magnetic permeability , a common quantity in electromagnetism, given the options involve current with negative exponents. Step 2: Derive the dimensions of .
The force per unit length between two current-carrying wires is: - Force per unit length:
- Distance :
- Current :
Step 3: Match with the options.
The dimensional formula matches option (A).