- #1
Lanc1988
- 19
- 0
Homework Statement
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?
F(0.8 sec) = ?? N
Homework Equations
The Attempt at a Solution
This problem has a walkthrough to help me solve it, however I have reached the end of the walkthrough and tried using the equation but it isn't working for me.
I find out the following in the walkthrough:
the change in flux (dF/dt) through the loop is 1.6*0.03*0.05
the current can be calculated using V=IR
and finally F = IwB
so for the answer I try: (.05/2)*.03*1.6 but it keeps saying that it is wrong.