Finding conventional current

1. Apr 9, 2012

laser123

Pull a rectangular loop through a magnetic field
In the figure a rectangular loop of wire L = 15 cm long by h = 2 cm high, with a resistance of R = 0.8 ohms, moves with constant speed v = 5 m/s as shown. The moving loop is partially inside a rectangular region where there is a uniform magnetic field (gray area) and partially in a region where the magnetic field is negligibly small.

image: http://www.webassign.net/mi3/21.P.082-Fig20.92a.jpg

In the gray region, the magnetic field points into the page, and its magnitude is B = 1.7 tesla.

(c) What is the conventional current in the loop?

______A
(d) Which of the following are true? Check all that apply.
Because a current flows in the loop, there is a magnetic force on the loop.
The magnetic force only stretches the loop; the net magnetic force on the loop is zero.
The magnetic force on the loop is in the same direction as the velocity of the loop.

(e) What is the magnitude of the magnetic force on the loop?
________N

2. Apr 9, 2012

tiny-tim

hi laser123!

show us what you've tried, and where you're stuck, and then we'll know how to help!

3. Apr 9, 2012

laser123

I'm stuck on C. I tried Fb=qvB then -Fb=qE then -Fb/q=E------->E*L=delta then deltaV/R=I

4. Apr 9, 2012

emf = Blv ?