Two long and parallel straight wires A and B carrying currents of 8.0 A and 5.0 A in the same direction are separated by a distance of 4.0 cm. Estimate the force on a 10 cm section of wire A, in newtons?

expects 2 × 10⁻⁵ N

24 checks, 0 agreed

draft 24: failed while solving — RuntimeError: no equation determines the force on a wire on a from what is known the engine knows: known: current of a; current of b; distance from the wire of a; length in the field of a; force_on_a_wire_across_a_field(a): force on a wire on a == ((current of a * length in the field of a) * B) — not yet known: magnetic_field

solution.rb · draft 24 failed while solving

1solve :two_parallel_wires, using: [MagneticFieldOfCurrents, MagneticForce] do2  objects :a, :b34  take current_a: a.current5  take current_b: b.current6  take separation: a.distance_from_the_wire789  deduce_from "a 10 cm section", a.length_in_the_field => "10 cm"1011  field = b.field_near_a_wire12  force = a.force_on_a_wire1314  answer force:, in: "N", figures: 11516  conclusion "Each wire produces a magnetic field at the other; the force per unit length is I*B, so the total force is I*l*B."17end

RuntimeError: no equation determines the force on a wire on a from what is known the engine knows: known: current of a; current of b; distance from the wire of a; length in the field of a; force_on_a_wire_across_a_field(a): force on a wire on a == ((current of a * length in the field of a) * B) — not yet known: magnetic_field