What is the force between moving charges?

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The discussion revolves around understanding the forces between moving charges, particularly in parts B and C of a homework problem. The user is struggling with the calculations involving the electric and magnetic forces, specifically questioning the distance squared in the equations and the relationship between the two forces. There is a mention of the electric force being greater than the magnetic force, and the user suspects that the angle at which the second charge moves relative to the magnetic field is affecting their calculations. The user is seeking clarification on these points as they are running out of attempts to solve the problem. Overall, the thread highlights the complexities of calculating forces in electromagnetic interactions.
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Homework Statement



http://img207.imageshack.us/img207/4245/picture2jwi.png

Homework Equations



see picture

The Attempt at a Solution



I don't know what is going wrong with part B and I'm running out of attempts! Please help me with that and part C as well.

Thanks
 
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j88k said:

Homework Statement



Homework Equations



The Attempt at a Solution



I don't know what is going wrong with part B and I'm running out of attempts! Please help me with that and part C as well.

Thanks

F = q2v X B1 = q2v *μo*q1v/(4π*2d2)

Your distance squared is 2d2 isn't it?
 
For part C) consider that

εoμo = 1/c2
 
didn't get it.. one more attempt left..

http://img17.imageshack.us/img17/3769/picture2zjr.png




and the answer for part C would be: The magnitude of the electric force is greater than the magnitude of the magnetic force. ?
 
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anyone?
 
I think the problem is that the second charge is moving at an angle to the field generated by the other charge.

I think the F then is a factor of √2/2 off. (The value of sinθ that v is relative to the B field.)
 
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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