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The magnitude of the charge

An inflated rubber ballon is rubbed with a wool cloth until an excess of 6.0 x 10^9 electrons is in the ballon. What is the magnitude of the charge on the ballon.  

Lost in Migration

  Read the article titled “Lost in Migration: Earth’s Magnetic Field Overdue a Flip” located at http://www.reuters.com/article/2012/10/03/us-science-earth-magneticfield-idUSBRE8920X620121003 (Links to an external site.). Read the article titled...

Electric current is generated and transported

a) Describe how an electric current is generated and transported. b) Assess the current state of national grid in the United States, as well as any challenges in updating this grid.  
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