yrelhan4
a wire is bent as a parabolic curve kept in x-y plane. the curve can be described by the equation x^2=6y. if a uniform magnetic field B=2*10^-3 k tesla (positive z direction) is applied, force experienced by the wire is nearly?
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yrelhan4
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oops. the wire carries a current i=2A
shubhamsrg
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length ?
yrelhan4
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|dw:1359707566710:dw|
shubhamsrg
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So the wire extends from (-6,6) to (6,6) only right ?
yrelhan4
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we dont know the x coordinates.
shubhamsrg
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Oh am sorry, I don't know why assumed the height to be 6,
nevermind.
shubhamsrg
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Okay, so the working formula is
F = iBl
shubhamsrg
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Where are you stuck ?
yrelhan4
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what should be l? or i always use idl * b. dl here..
shubhamsrg
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l = distance between 2 ends of wire.
yrelhan4
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we should have x coordinates then?
shubhamsrg
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nopes. distance between the ends is already given right,
shubhamsrg
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|dw:1359708383481:dw|
shubhamsrg
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Is that 6 ? or the co-ordinate on y axis (0,6) ?
yrelhan4
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coordinate on y axis.
shubhamsrg
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I see,
then use the given eqn, find co-ordinates of x, as I said before, they should come out to be
(-6,6) and (6,6)
yrelhan4
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ohho.. ok. damn. it was easy. :P thank you.
shubhamsrg
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you should also be able to find out direction of force, can you tell me what will that be ?
yrelhan4
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-j?
shubhamsrg
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Yep, ^_^
yrelhan4
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hmm. thank you. :)
shubhamsrg
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Note that direction of force is different at different points on the force, -j is the direction of net force.
Anyways, glad to help.
shubhamsrg
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different at different points of the wire*