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  1. ...neutral object should have zero potential, unless the object is under the action of an external electric field. The electric potential of an atom is zero, because the ...

    分類:科學及數學 > 物理學 2016年12月04日

  2. ... a system, -ve work needs to be done by an external agent ( external force ). In other words, energy is absorbed by that external agent...

    分類:科學及數學 > 物理學 2016年09月11日

  3. ... on it. But in the situation you described, there is an external force , gravity, that acts on the object during its motion.

  4. 1. Electric field at mid-point = [k(-8x10^-6)/0.04 + k(7x10^-6)/0.04] v/m where k is the Coulomb constant (=9x10^9 N.m^2/C^2) The direction of the field is towards the -ve charge. 2. These are standard electric field diagrams, which you could find in...

  5. ...bottom. Since a magnet tends to align with the external magnetic field lines, the coil will move with its...with the field lines. 2.Yes, direction of magnetic force is pointing horizontally towards the right. ...

  6. ...will decrease... 2014-07-30 16:17:42 補充: (cont'd)... The pushing force on B will cease when the speed of B is equal to or greater...

  7. ...only valid on an isolated system. That is, there is no external force acting on the syste. Here in the example, the wall provides an...

  8. ..., to keep the coil continuously rotating at constant speed, an external force ( external torque) must be applied to the coil. It is the mechanical...

  9. ... at about 18 years old the pain could be by her own or external force 1. when her breasts grow, her skin will stretch which cause...

  10. They must be fighting, normally the neck won't break, unless they fall, or fight, or unknown personal use external force to break their neck.

    分類:寵物 > 魚兒 2013年11月20日