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  1. H

    Direction of electric field

    My friend provided me with the teaching materials from a course he took. The assignment of fingers is switched around. B is the middle finger, F thumb and I index finger. As long as it yields the same result, there's no harm done! Thanks a million for guiding me along so generously. I'm really...
  2. H

    Direction of electric field

    ok, so, index finger(particles) on the +x-axis, thumb (magnetic field) on +y-axis, so magnetic force is actually "into the paper", i.e. the positive z-axis? I will need some sort of hand massage after this ;)
  3. H

    Direction of electric field

    my reply got deleted as I wasn't logged in properly... the electric field, like the magnetic force should be perpendicular to the magnetic field. I used your formula blue_leaf77 for the calculations. I think I actually need to use the right hand rule to determine the direction? That gave me a...
  4. H

    Direction of electric field

    Homework Statement beam of protons moving in +x direction at speed v electric field is perpendicular to magnetic field magnetic field in +y direction no deflection What direction/sign has the electric field? Homework Equations not looking for numerical solutions The Attempt at a Solution...
  5. H

    2 vectors with cylindrical polar coordinates

    So, I'd could divide by the product of their magnitudes to get the cosine of the angle? Ok, that is straight-forward, thanks! ------- EDIT: Also thanks for clarifying vector displacement vs distance!
  6. H

    Are there some people in life who don't have to work for any

    I will inform my niece next time I see her, that I do in fact rock ;) Also, my pleasure and good luck with whatever life throws your way.
  7. H

    Are there some people in life who don't have to work for any

    exactly. Very often relationships are messy in so many ways and do not provide the happiness, security and unconditional love one should get out of it. While that may not what everybody is looking for in a relationship, why would you settle for anything but the best? That sounds promising :) So...
  8. H

    Are there some people in life who don't have to work for any

    From my experience a lot of people your age feel exactly like you. As has been said, there is a prevalent tendency to overstate the intimacy/happiness and number of relationships(friends and partners) - most people don't want to appear to be a loner. If you can't afford your own place, maybe...
  9. H

    2 vectors with cylindrical polar coordinates

    ok, dot product would be =Px*Qx + Py*Qy + Pz*Qz using the cartesian coordinates, correct? for c) that would be for P: Sqrt(2^2+3^2) and for Q: SQRT( 4^2+6^2) ? I'll have another look at e) later. Thanks so much this really helped already. I think I have to read up more on unit vectors...
  10. H

    2 vectors with cylindrical polar coordinates

    Oh my, right, that was silly. It should be like so, right? sqrt( (Px - Qx)^2 + (Py - Qy)^2 + (Pz - Qz)^2 ) would you please comment on part a) and b) as well? you are so right, WrongMan! Thanks for that. so if I'm not mistaken: c) P: 2m Q: 4m e) With all lenghts of an imaginary triangle...
  11. H

    2 vectors with cylindrical polar coordinates

    Hi this isn't my homework, but it is taken from a worksheet for a Maths course(trying to refresh my rusty math), so I hope it fits in here. 1. Homework Statement two cylindrical polar vectors with same origin: P(2,55°,3); Q(4,25°,6) units in m Homework Equations a) Express in cartesian...
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