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Review. Charges have _________________________ associated with their position in an ____________________________ Charges that are moving naturally in an ____________________, lose / gain _______________________________ _____________________ characterizes the charge - PowerPoint PPT Presentation
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ReviewCharges have _________________________ associated with their position in an ____________________________
Charges that are moving naturally in an ____________________, lose / gain _______________________________
_____________________ characterizes the charge
Ratio of __________________ per charge is called _____________________
Ratio of ___________________ per charge is called __________________________________________________
Positive charge naturally moves through a _____________________________
Negative charge naturally moves through a ____________________________
Unit Play
Potential in EF of a point chargeWhite board practice:
+ 5.0 C
1.0 m
2.0 m
1. Find the magnitude of the field at point A and at point B.2. Potential energy of a +2.0nC charge at each point (refer to the analogy with PEg)3. Find the change of EPE as the charge moves
A B
Potential in EF of a point chargeWhite board practice:
+ 5.0 C
1.0 m
2.0 m
1. Determine potential difference between the two points.2. Make a conclusion about the potential (magnitude) as the distance to the
charge increases / decreases.3. As you get closer to the positive charge, V is ______________________4. As you move away from the positive charge, V is ___________________
A B
Potential in EF of a point chargeWhite board practice:
- 5.0 C
1.0 m
2.0 m
1. Find the magnitude of the field at point A and at point B.2. Find the change of EPE for a +2nC charge as it moves:
A B
Potential in EF of a point chargeWhite board practice:
- 5.0 C
1.0 m
2.0 m
1. Determine potential difference between the two points.2. Make a conclusion about the potential (magnitude) as the distance to the
charge increases / decreases.3. As you get closer to the positive charge, V is ______________________4. As you move away from the positive charge, V is ___________________
A B
Deriving the formula for potential near a point charge
Potential around a positive charge is _________________
Potential around a negative charge is ________________
Potential is a scalar!
2.0 m
Find the potential midway between the two charges:
a) +2.0 nC and – 4.0 nCb) -2.0 nC and +4.0 nCc) -6.0 nC and +6.0nC
Midpoint problems revisited
2.0 m
Is there a net force on the point between the two charges?Is there a net field between the two charges?Is there a net potential between the two charges?
Midpoint problems revisited
2.0 m
If you know the net field between the charges, you can predict
_________________________________________________________________
If you know the net potential between the charges, you can predict
_________________________________________________________________
Zero V vs. ES equilibrium
What can you say about the two charges if you know that Vnet = 0 at midpoint?
In that case, what can you say about the net field?
What will happen to a ‘stray’ charge if it ends up at that point?
Find the point where Enet and Vnet are 0
2.0 m
Charges: +1.0 nC and – 4.0 nC