A wire AB is carrying a steady current of 12 A and is lying on the table. Another wire CD carrying 5 A is held directly above AB at a height of 1mm. Find the mass per unit length of the wire CD so that it remains suspended at its position when left free. Give the direction of the current flowing in CD with respect to that in AB. [Take the value of `g = 10 ms^(-2)`]

Explanation

To solve the problem step by step, we need to analyze the forces acting on wire CD and how they relate to the current in wire AB.

### Step 1: Identify the forces acting on wire CD
Wire CD is held above wire AB and carries a current. The forces acting on wire CD are:
- The gravitational force (weight) acting downward, \( F_g = mg \)
- The magnetic force due to the interaction with wire AB, acting upward.

### Step 2: Set up the equilibrium condition
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