Magnetism Problem: Magnitude & Direction of Force

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The discussion focuses on calculating the magnitude and direction of the force acting on wire 1 due to the magnetic field from wire 2, emphasizing the importance of mastering this type of problem using the Lorentz Force. It highlights that since the currents in the wires are opposite, they will repel each other. The necessity of knowing the length of the wires is mentioned, as it affects the calculation; without it, the force should be expressed as force per unit length. Participants are encouraged to clarify their units and ensure they provide the correct information for accurate calculations. Understanding these principles is crucial for solving magnetism problems effectively.
blue_soda025
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Could someone help me with this problem? I don't really know how to do it..

http://www.webpost.net/bl/bluesoda025/magnetism.gif

What is the magnitude and direction of force acting on wire 1 due to the magnetic field produced by wire 2?
 
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This type of problem is a huge deal, you should attempt to master it. It uses the Lorentz Force.

More information http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfor.html"
 
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On that site too, here it has specifically the paraelle wires.

here

And since the currents are opposite, should repel from each other. Oh yeah, was there a length of one of the wires given too? I'll have to dig out my book, think it derived 2 infinite wires, I'll get back to you on that.
 
Unless the length of the wire is known, you'll have to specify the force per unit length.
 
Skomatth said:
Unless the length of the wire is known, you'll have to specify the force per unit length.
Often, in problems like this, "force" is loosely asked for when really it should be "force per unit length". So, make sure you give the answer in the correct units.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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