ajprincess
  • ajprincess
Plzz help A wire of 1m long carries a current of 10A and makes an angle of 30degrees with the uniform magnetic field B=1.5T. Calculate the magnitude and the direction of the force on the wire.
Physics
schrodinger
  • schrodinger
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ajprincess
  • ajprincess
|dw:1337316891433:dw| Am I right?
anonymous
  • anonymous
I think you are right let me double check
ajprincess
  • ajprincess
ha k

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anonymous
  • anonymous
IL X B so it is ILB Sin(theta) so yes :)
ajprincess
  • ajprincess
Vat abt the direction? :)
anonymous
  • anonymous
I think it will point into the screen let me check tho
experimentX
  • experimentX
force will always be perpendicular to the plane containing the direction of magnetic field and the wire.
anonymous
  • anonymous
but either way it will be perpendicular to both the Length of the wire and B
anonymous
  • anonymous
|dw:1337272230240:dw| I think this is how it will look. At least in my mind.
anonymous
  • anonymous
In that pic the force points away from screen.
anonymous
  • anonymous
use right hand rule|dw:1337272446404:dw| think of your knuckles as L and tip of fingers as B and F is where your thumb points too. Sorry about drawing :P
anonymous
  • anonymous
|dw:1337272618747:dw|
ajprincess
  • ajprincess
V need to use right hand rule or fleming's left hand rule? I remember that in the right hand rule the thumb points towards the direction of the current. Am I right? am nt sure?
anonymous
  • anonymous
depends on situation
experimentX
  • experimentX
these are all derivative of vector multiplication ...
anonymous
  • anonymous
qVxB|dw:1337272984176:dw|
anonymous
  • anonymous
qVxB the first term always curls into the second term Then use right hand rule Knuckles is first term, tip of fingers is second term and thumb is the product (force)
ajprincess
  • ajprincess
oh k. In both ways of u guys @timo86m and @experimentX and in my way the answer comes as the same
anonymous
  • anonymous
Well you have to use your formula either way Sin(theta) *ILB but you need IL x B to know that L curls into B :)
ajprincess
  • ajprincess
Thanxxxx for the help.:)
anonymous
  • anonymous
:D

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