# Coil Moving through a Magnetic Field

1. Jul 22, 2012

### jdmarquardt

1. The problem statement, all variables and given/known data

At t=0, a rectangular coil of resistance R = 2 ohms and dimensions w = 3 cm and L = 8 cm enters a region of constant magnetic field B = 1.6 T directed into the screen as shown. The length of the region containing the magnetic field is LB = 15 cm. The coil is observed to move at constant velocity v = 5 cm/s. What is the force required at time t = 0.8 sec to maintain this velocity?
image:
https://wug-s.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?cc/DuPage/phys2112/summer/homework/Ch-27-Induction/IE_B_field_from_movingcoil/pic2.gif [Broken]

not actually sure where to start. any suggestions on where to start would be welcomed.
Thank you.

Last edited by a moderator: May 6, 2017
2. Jul 22, 2012

### TSny

Hi jdmarquardt. Since you are asked to find a force, you should first try to understand conceptually why a force would be required to move the coil at constant speed.