College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 6

A uniform horizontal wire with a linear mass density of 0.50 g/m carries a 2.0-A current. It is placed in a constant magnetic field with a strength of 4.0 × 10 3 T. The field is horizontal and perpendicular to the wire. As the wire moves upward starting from rest, (a) what is its acceleration and (b) how long does it take to rise 50 cm Neglect the magnetic field of Earth.