Charging by Induction
Charging by Induction
A charged object may induce a charge in a nearby neutral object without touching it. For example, if a positively charged object is brought near a neutral object, the electrons in the neutral object are attracted to the positive object. (This is using law 3 of our laws of repulsion and attraction)
Some of these electrons flow to the side of the neutral object that is nearest to the positive object. This side of the neutral object accumulates electrons and becomes negatively charged. Because electrons leave the far side of the neutral object while its protons remain stationary, that side becomes positively charged.
Since the negatively charged side of the neutral object is closest to the positive object, the attraction between this side and the positive object is greater than the repulsion between the positively charged side and the positive object. The net effect is an attraction between the objects.
Similarly, when a negatively charged object is brought near a neutral object, the negative object induces a positive charge on the near side of the neutral object and a negative charge on the far side. As before, the net effect is an attraction between the objects.
The induced charges described above are not permanent. As soon as the charged object is taken away, the electrons on the other object redistribute themselves evenly over it, so that it again becomes neutral. The way that we cna alter the overall charge of the object while using induction is to use a ground. A ground allows electrons to flow inot or out of the object depending on the charge of the object that is brought near to our neutral object.
Here is a great little link that will show you a simple diagram to help explain today's lesson.
http://www.physics.sjsu.edu/facstaff/becker/physics51/images/22_04_Charging_by_induction.jpg OR
http://solomon.physics.sc.edu/~tedeschi/courses/212/induction.jpg
HOMEWORK:
This will be shown in your course kits on pr 11 and 12. Please note there are prinitng mistakes in the kit and will need to be corected during today's lesson. We will practice our drawing techniques to prepare ourselves for tomorrows lab. Charging detective lab 9B.
Pg 306 # 1 - 5
Read pg 311 on grounding and take notes.
A charged object may induce a charge in a nearby neutral object without touching it. For example, if a positively charged object is brought near a neutral object, the electrons in the neutral object are attracted to the positive object. (This is using law 3 of our laws of repulsion and attraction)
Some of these electrons flow to the side of the neutral object that is nearest to the positive object. This side of the neutral object accumulates electrons and becomes negatively charged. Because electrons leave the far side of the neutral object while its protons remain stationary, that side becomes positively charged.
Since the negatively charged side of the neutral object is closest to the positive object, the attraction between this side and the positive object is greater than the repulsion between the positively charged side and the positive object. The net effect is an attraction between the objects.
Similarly, when a negatively charged object is brought near a neutral object, the negative object induces a positive charge on the near side of the neutral object and a negative charge on the far side. As before, the net effect is an attraction between the objects.
The induced charges described above are not permanent. As soon as the charged object is taken away, the electrons on the other object redistribute themselves evenly over it, so that it again becomes neutral. The way that we cna alter the overall charge of the object while using induction is to use a ground. A ground allows electrons to flow inot or out of the object depending on the charge of the object that is brought near to our neutral object.
Here is a great little link that will show you a simple diagram to help explain today's lesson.
http://www.physics.sjsu.edu/facstaff/becker/physics51/images/22_04_Charging_by_induction.jpg OR
http://solomon.physics.sc.edu/~tedeschi/courses/212/induction.jpg
HOMEWORK:
This will be shown in your course kits on pr 11 and 12. Please note there are prinitng mistakes in the kit and will need to be corected during today's lesson. We will practice our drawing techniques to prepare ourselves for tomorrows lab. Charging detective lab 9B.
Pg 306 # 1 - 5
Read pg 311 on grounding and take notes.
posted by Mr. V. T. Smith @ Monday, October 18, 2004
4 Comments:
At 3:09 p.m.,
Anonymous said…
For something to become neutral to you have to ground it?
At 3:19 p.m.,
Anonymous said…
Yes, I think you do have to ground it but I'm not sure.
At 9:11 p.m.,
Anonymous said…
Yes for sure!!!!
At 6:11 a.m.,
Mr. V. T. Smith said…
Yes, in order to make an object neutral after it has changed its overall charge, you must ground it. It is as simple as just touching the object and this will act as a ground.
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