Part of eval main bdd945f six, agent version bdd945f
Q. 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
draft 5: failed in solution.rb, line 9 — NoMethodError: undefined method 'separation' for an instance of Physics::PhysicalObject; separation is a quantity of CoulombsLaw, ElectricField, TravellingWave, which the solution's laws leave out (add one to using:), not a method: reach it from an object, as <object>.separation, qualified as needed by from: <object>; or take one the solution's laws already name for that kind of quantity: radius, length_of_the_coil, distance_from_the_wire
Latest draft
question.rb1 question :two_parallel_wires do2 kind :numerical3 describes "Two long and parallel straight wires A and B carrying currents of %{current_a} and %{current_b} in the same direction are separated by a distance of %{separation}. %{force} on a %{length} section of wire A, in newtons?"4 given current_a: "8.0 A"5 given current_b: "5.0 A"6 given separation: "4.0 cm"7 given length: "10 cm"8 asks force: "Estimate the force"9 end
solution.rb1 solve :two_parallel_wires, using: [MagneticFieldOfCurrents, MagneticForce] do2 objects :a, :b3 4 take current_a: a.current5 take current_b: b.current6 take length: a.length_in_the_field7 take separation: a.distance_from_the_wire(from: b)8 9 deduce_from "separated by a distance of 4.0 cm", a.separation(from: b) => "4.0 cm"10 11 B = b.field_near_a_wire12 force = a.force_on_a_wire13 14 answer force:, in: "N", figures: 215 16 conclusion "Wire B produces a magnetic field at wire A, and the current in A feels a force from that field."17 end