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![[Post New]](/templates/default/images/icon_minipost_new.gif) 17 Jun 2007 16:49:42 IST
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1.A semicircular wire of radius 5.0 cm carries a current of 5.0 A.A magnetic field B of magnitude 0.50 T exists along the perpendicular to the plane of the wire.Find the magnitude of the magnetic force acting on the wire.
2.A wire carrying a current i is kept in the X-Y plane along the curve y =A sin[2
x/lambda].A magnetic field B exists in the z-direction .Find the magnitude of the magnetic force on the portion of the wire between x=0 and x=lambda.
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Force on a current carrying wire placed in a magnetic field is given by :
F =  i(dlxB)
In case of semi-circular loop dl = AB (vector along the diameter AB)
Since AB and B are perpendicular, |ABxB| = (AB)(B)
So magnitude of force = i(AB)B
F = (5)(0.1)(0.5) = 0.25 N
Post your other query on a new page.
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Bipin Kumar Dubey
Chemical Dept.
IIT Kharagpur
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this reply: 5 points
(with 1 
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