Week4Concepts.pdf - ConcepTest 23.5a Equipotential Surfaces I 1 At which point does V = 0 ConcepTest 23.5a Equipotential Surfaces I 5 all of them does V

Week4Concepts.pdf - ConcepTest 23.5a Equipotential Surfaces...

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1 Page 1 At which point does V = 0? 1 3 2 4 + Q Q 5) all of them ConcepTest 23.5a Equipotential Surfaces I At which point does V = 0? 1 3 2 4 + Q Q 5) all of them All of the points are equidistant from both charges . Since the charges are equal and opposite, their contributions to the potential cancel out everywhere along the mid-plane between the charges. ConcepTest 23.5a Equipotential Surfaces I Follow - up: What is the direction of the electric field at all 4 points? Which two points have the same potential? 1) A and C 2) B and E 3) B and D 4) C and E 5) no pair A C B D E Q ConcepTest 23.6 Equipotential of Point Charge Since the potential of a point charge is: only points that are at the same distance from charge Q are at the same potential . This is true for points C and E. They lie on an equipotential surface . Which two points have the same potential? 1) A and C 2) B and E 3) B and D 4) C and E 5) no pair A C B D E Q r Q k V = ConcepTest 23.6
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Unformatted text preview: Equipotential of Point Charge Follow-up: Which point has the smallest potential? Which requires the most work , to move a positive charge from P to points 1 , 2 , 3 or 4 ? All points are the same distance from P . 1) P ® 1 2) P ® 2 3) P ® 3 4) P ® 4 5) all require the same amount of work P 1 2 3 E r 4 ConcepTest 23.7a Work and Electric Potential I For path #1 , you have to push the positive charge against the E field, which is hard to do . By contrast, path #4 is the easiest, since the field does all the work. Which requires the most work , to move a positive charge from P to points 1 , 2 , 3 or 4 ? All points are the same distance from P . 1) P ® 1 2) P ® 2 3) P ® 3 4) P ® 4 5) all require the same amount of work P 1 2 3 E r 4 ConcepTest 23.7a Work and Electric Potential I...
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