Simple Magnetic Field Question.

AI Thread Summary
To determine the direction of motion, current, and magnetic field, it's essential to use the right-hand rule, which involves the thumb pointing along the current and fingers curling in the direction of the magnetic field. The discussion clarifies that the right-hand grip rule focuses on two directions, while the right-hand rule incorporates three. Participants express confusion about how to apply these concepts to their homework, indicating a need for clearer understanding. Resources like HyperPhysics are recommended for better visual aids. Overall, the conversation emphasizes the importance of grasping these fundamental rules in solving magnetic field problems.
gabloammar
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Homework Statement



In the attachment.

Homework Equations



The left hand rule. [and the right hand grip rule maybe?]

The Attempt at a Solution



Aren't we supposed to have two of three things [out of direction of motion, direction of current, and direction of magnetic field] to find the third thing? I'm stuck at the the first question so I can't really move on to the next one. Could someone please help?

I don't know where to start. I checked my textbook and I don't know what information to use from it. It's not making a lot of sense. Could someone please help?
 

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  • June '06.Q 6 (a) (i,ii)..jpg
    June '06.Q 6 (a) (i,ii)..jpg
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hi gabloammar! :smile:
gabloammar said:
Aren't we supposed to have two of three things [out of direction of motion, direction of current, and direction of magnetic field] to find the third thing?

no, that's a different hand! :biggrin:

the one you want is with the thumb pointing along the current, the fingers curl round the wire in the direction of the magnetic field …

see hyperphysics for the best diagrams! :smile:
 
Thanks for the reply!

That's the right hand rule then isn't it?

And I wanted to ask, what's the difference between the right hand grip rule and the right hand rule?
 
hi gabloammar! :smile:

the right hand grip rule has only two directions, the thumb and the curling fingers

the right hand rule has three directions, the thumb, the index finger, and the other fingers :wink:
 
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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