How do you determine if a charged comb is positively charged or negatively charged. suppose it is positively charged, it will attract negative charge on the electroscope and the positive charges on the leaves will repel. if it is negatively charged, it will attract positive charge leaving the negative leaves to repel

The two required components for a generator are

Write down two additional questions about earth's magnetic field that will make your presentation more informative.

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)