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.
Physical Science
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 “Earth’s Inconstant Magnetic Field” located at http://www.nasa.gov/vision/earth/lookingatearth/29dec_magneticfield.html (Links to an external site.). a) Describe how the Earth’s magnetic field is generated, and how it has changed throughout Earth’s history. …
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.
