Q. A bicycle wheel has a diameter of 64.1 cm and a mass of 1.81 kg. Assume that the wheel is a hoop with all of the mass concentrated on the outside radius. The bicycle is placed on a stationary stand and a resistive force of 120 N is applied tangent to the rim of the tire.
Q. A metal rod of length 21.4 cm and mass 111 g is free to slide over two parallel, horizontal metallic rails connected to a 10.0 V battery. The battery has internal resistance of 0.100 Ω, and the rod and rails have negligible resistance. A 1.96 T magnetic field is directed perpendicular to the plane of the circuit.
Find the magnetic force on the rod.