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Dell
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in the diagram is a wire which lies in a magnetic field B, what is the force on the wire if a current of I flows through it and its geometry is comprised of 2 straight ends with a length of L each and a half circle with a radius of R??
http://lh6.ggpht.com/_H4Iz7SmBrbk/SiK5CuRdZXI/AAAAAAAABBI/pqhREiis00U/s720/Untitled.jpg [Broken]
what i did was break it up into 3 parts, the 2 ends and the circular part,,,
for all the parts, F=ILxB, but the angle is 90 dor all parts, so F=ILB
for the ends F=ILB
for the cricle F=I*(pi)*R*B
Ftotal=IB(2L+piR)
but the answer ios somehow meant to be
F=2IB(L+R)
cna someone see how this can be?
http://lh6.ggpht.com/_H4Iz7SmBrbk/SiK5CuRdZXI/AAAAAAAABBI/pqhREiis00U/s720/Untitled.jpg [Broken]
what i did was break it up into 3 parts, the 2 ends and the circular part,,,
for all the parts, F=ILxB, but the angle is 90 dor all parts, so F=ILB
for the ends F=ILB
for the cricle F=I*(pi)*R*B
Ftotal=IB(2L+piR)
but the answer ios somehow meant to be
F=2IB(L+R)
cna someone see how this can be?
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