Two parallel straight wires are 7.0 cm apart and 50 m long.Each one carries a 18-A current in the same direction.One wire is securely anchored,and the other is attached in the center to a movable cart.If the force needed to move the wire when it is not attached to the cart is negligible,with what magnitude force does the wire pull on the cart? (μ₀ = 4π × 10^-7 T ∙ m/A) A)46 mN B)37 mN C)66 mN D)93 mN

Question

Quizplus · Accepted Answer

The force per unit length between two parallel currents is given by F/L = (μ₀ * I₁ * I₂) / (2π * d). Substituting the given values: F = (4π × 10⁻⁷ T ∙ m/A * 18 A * 18 A * 50 m) / (2π * 0.07 m) = 0.046 N = 46 mN.

Two Parallel Straight Wires Are 7