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July 25, 2014

Homework Help: physics

Posted by Anonymous on Friday, April 18, 2008 at 12:33pm.

1)Two metal spheres are suspended from insulation threads. A negatively charged rod is brought near these spheres. One shere is pushed away from the rod and the other atracted towards it. Describe the behavior of the spheres.

I know one has to be negative and the other positive but I don't know what else they're looking for.

2)The electricity received at an electric substation has a potential difference of 2.80 x 10^5 V. If the required output is 440 V, what should be the ratio of the turns of the step-down transformer?

I know the transformer equation is:

Is/Ip = Vp/Vs = Np/Ns

Thats the closest thing I could find regarding this problem

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