Chapter 16. Coulomb’s law (16-1)

Question

GlyjYdcNntTwxk6eNCNnUEoVzqpmDS5rFnscftFwZ10DzvXd1IlqnOPaGk9eGYLfRiQ8++X//7ZXMAee8WLBquOYOSR4WWmAPOy7NGvcnj+pBKnZPlK4iTk+VmbNQm8Bs53f3g==

{"title":"Any two point charges q sub 1 and q sub 2 exert equally strong electric forces on each other.","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"poly\",\"coords\":\"144,22\"},{\"shape\":\"rect\",\"coords\":\"1,21,17,48\"},{\"shape\":\"rect\",\"coords\":\"100,21,125,45\"}]"} {"title":"Coulomb constant","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"206,2,229,27\"}]"} {"title":"Absolute values of the point charges","description":"Wrong","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"234,7,253,31\"},{\"shape\":\"rect\",\"coords\":\"268,5,287,30\"}]"} {"title":"Distance between the point charges","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"242,45,260,63\"}]"}

Question

O/vKXcQmzlU6zTGNJD/cTVj80sI=

{"title":"Any two point charges q sub 1 and q sub 2 exert equally strong electric forces on each other.","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"poly\",\"coords\":\"144,22\"},{\"shape\":\"rect\",\"coords\":\"1,21,17,48\"},{\"shape\":\"rect\",\"coords\":\"100,21,125,45\"}]"} {"title":"Coulomb constant","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"206,2,229,27\"}]"} {"title":"Absolute values of the point charges","description":"Wrong","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"234,7,253,31\"},{\"shape\":\"rect\",\"coords\":\"268,5,287,30\"}]"} {"title":"Distance between the point charges","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"242,45,260,63\"}]"}

Question

QJIB+qAShen3X6uLv1B1Fhe7/fLbfSKgwqy/EjrlxZgFy2bkbCAy9w==

{"title":"Any two point charges q sub 1 and q sub 2 exert equally strong electric forces on each other.","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"poly\",\"coords\":\"144,22\"},{\"shape\":\"rect\",\"coords\":\"1,21,17,48\"},{\"shape\":\"rect\",\"coords\":\"100,21,125,45\"}]"} {"title":"Coulomb constant","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"206,2,229,27\"}]"} {"title":"Absolute values of the point charges","description":"Correct!","type":"correct","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"234,7,253,31\"},{\"shape\":\"rect\",\"coords\":\"268,5,287,30\"}]"} {"title":"Distance between the point charges","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"242,45,260,63\"}]"}

Question

F7nQFApL+MYYvO7+lYY//dl2GULunnvnXbeZmRyZjSSPiK6Pes4/Ng==

{"title":"Any two point charges q sub 1 and q sub 2 exert equally strong electric forces on each other.","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"poly\",\"coords\":\"144,22\"},{\"shape\":\"rect\",\"coords\":\"1,21,17,48\"},{\"shape\":\"rect\",\"coords\":\"100,21,125,45\"}]"} {"title":"Coulomb constant","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"206,2,229,27\"}]"} {"title":"Absolute values of the point charges","description":"Wrong","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"234,7,253,31\"},{\"shape\":\"rect\",\"coords\":\"268,5,287,30\"}]"} {"title":"Distance between the point charges","description":"Correct!","type":"correct","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"242,45,260,63\"}]"}

Review

A point charge is an idealization, just like a massless rope or a frictionless incline, but it’s a good description in many situations where charged objects interact with each other. Coulomb’s law tells us the magnitude of the electric force that two point charges \(q_1\) and \(q_2\) separated by a distance \(r\) exert on each other: