Two wires are parallel but have current travelling in opposite directions. Wire 1 has a current of 3 A and wire 2 has a current of 7 A. If the wires are 2 cm apart, what is the force each wire experiences per unit length and what direction is the force?

The force each wire experiences per unit length and what direction is the force are 2.1 x 10⁻⁴ N and repulsive.

Explanation:

given information:

the current of wire 1, I₁ = 3 A

the current of wire 2, I₂ = 7 A

the distance of two wire, r = 2 cm = 0.02 m

to find the force per unit length of each wire experience, we can use the

= μ₀

where

F = the magnetic force

I =current

r = the distance of the wire

μ₀  = permeability of vacuum (4π x 10⁻⁷ T.m/A)

thus,

= μ₀

  = (4π x 10⁻⁷)

  = 2.1 x 10⁻⁴ N (Repulsive)

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explanation: