Recent content by cdingdong

  1. C

    Magnetic field on current loop, involves rotational energy

    ahhhh, i see. well, that will solve my problem. thanks Doc Al!
  2. C

    Magnetic field on current loop, involves rotational energy

    wow, now that you bring it up, i realize my mistake. you're right! i forgot the final potential energy. so, the answer works, but there is something that bothers me. Ki + Ui = Kf + Uf there is no initial kinetic energy because it came from rest, so that is zero Ui = Kf + Uf...
  3. C

    Magnetic field on current loop, involves rotational energy

    Homework Statement A rectangular loop of sides a = 0.3 cm and b = 0.8 cm pivots without friction about a fixed axis (z-axis) that coincides with its left end (see figure). The net current in the loop is I = 3.2 A. A spatially uniform magnetic field with B = 0.005 T points in the +y-direction...