A metal bar of mass and length rests on two smooth
PHYSICS · Multi-part · AP · Physics C: Electricity and Magnetism · Magnetic Fields and Electromagnetism · Magnetic Fields and Electromagnetism
Problem
A metal bar of mass 1.5kg and length 0.60m rests on two smooth, horizontal, parallel rails that are 0.60m apart. A uniform vertical magnetic field of 0.15T is present in the entire region. The bar is connected to a battery so that a current of 10A flows through it from one rail to the other.
(i) Calculate the magnitude and state the direction of the magnetic force acting on the bar.
(ii) Determine the acceleration of the bar along the rails, ignoring any friction.
(iii) If a constant opposing frictional force of 5N acts on the bar, what current should be adjusted in the circuit so that the bar slides with constant velocity?