1. Two gilded pith balls having a mass of 100 mg each are suspended in air by silkthreads 30 cm long attached to a common point. When the balls are given equal charges, they are repelled to a distance of 18 cm from each other. What is the charge on each ball? (Answer: 3.09 statcoulomb). Write the Given, FBD or diagram, and the solution.

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Stator and Rotor Magnetic Field

The stator and rotor magnetic field is the resulting magnetic field generated by a system of coils that are symmetrically aligned. They are supplied with polyphase currents. The magnetic field is generated by poly-phase (two or more phases) current or single-phase current. In the latter case, two field stator windings are supplied and two resulting electromagnetic fields are generated beyond the stage.