A straight conducting rod of length 0.25 m and mass 50 g rests on two smooth
PHYSICS · Multi-part · AP · Physics C: Electricity and Magnetism · Magnetic Fields and Electromagnetism · Magnetic Fields and Electromagnetism
Problem
A straight conducting rod of length 0.25 m and mass 50 g rests on two smooth, horizontal metallic rails that are 0.25 m apart and connected to form a closed circuit. The arrangement lies in a uniform magnetic field of 0.60 T acting vertically downward. A steady current of 4.0 A flows through the rod from left to right.
(a) Calculate the magnitude of the magnetic force acting on the rod.
(b) Determine the acceleration produced in the rod.
(c) Assuming the rod starts from rest and friction is negligible, find its speed after 0.40 s.