chapter23bnotes

# chapter23bnotes - Zero Resultant Force Exercise Do it at...

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Zero Resultant Force, Exercise. Do it at home! square6 Where is the resultant force equal to zero? square6 The magnitudes of the individual forces will be equal square6 Directions will be opposite square6 Will result in a quadratic square6 Choose the root that gives the forces in opposite directions

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Electric Field – Introduction square6 The electric force is a field force square6 Field forces can act through space square6 The effect is produced even with no physical contact between objects square6 Faraday developed the concept of a field in terms of electric fields
Electric Field – Definition square6 An electric field is said to exist in the region of space around a charged object square6 This charged object is the source charge square6 When another charged object, the test charge , enters this electric field, an electric force acts on it

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Electric Field – Definition, cont square6 The electric field is defined as the electric force on the test charge per unit charge square6 The electric field vector, E , at a point in space is defined as the electric force F acting on a positive test charge, q o placed at that point divided by the test charge: E = F e / q o
Electric Field, Notes square6 E is the field produced by some charge or charge distribution, separate from the test charge square6 The existence of an electric field is a property of the source charge square6 The presence of the test charge is not necessary for the field to exist square6 The test charge serves as a detector of the field

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Relationship Between F and E square6 F e = q E square6 This is valid for a point charge only square6 One of zero size square6 For larger objects, the field may vary over the size of the object square6 If q is positive, F and E are in the same direction square6 If q is negative, F and E are in opposite directions
Electric Field Notes, Final square6 The direction of E is that of the force on a positive test charge square6 The SI units of E are N/C square6 We can also say that an electric field exists at a point if a test charge at that point experiences an electric force

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Electric Field, Vector Form square6 Remember Coulomb’s law, between the source and test charges, can be expressed as square6 Then, the electric field will be 2 ˆ o e e qq k r = F r 2 ˆ e e o q k q r = = F E r
More About Electric Field Direction square6 a) q is positive, F is directed away from q square6 b) The direction of E is also away from the positive source charge square6 c) q is negative, F is directed toward q square6 d) E is also toward the negative source charge

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