Chapter 30, Problem 30.2OQ

In Figure 30.7, assume I₁ = 2.00 A ami I₂ = 6.00 A. What is the relationship between the magnitude F₁, of the force exerted on wire 1 and the magnitude of the force exerted on wire F₂? (a) F₁= 6F₂ (b) F₁ = 3F₂, (c) F₁, = F₂ (d) F₁ = ⅓F₂ (e) F₁ = $\frac{1}{6}$F₂.

The field ${\stackrel{\to }{\text{B}}}_{\text{2}}$, duo lo the current in wire 2 exerts a magnetic force of magnitude F₁ = I₁ℓB₂, on wire I.

Figure 30.7 Two parallel wires that each carry a steady current exert a magnetic force on each other. The force is attractive if the currents are parallel (as shown) and repulsive if the currents are antiparallel.