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Potential and Field. Connection between Potential and Fields Electric Field around a Conductor EMF or Batteries. Reading Questions. What quantity is represented by the symbol ?. 1. Electronic potential 2. Excitation potential 3. Electromotive force 4. Electric stopping power
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Potential and Field
Connection between Potential and Fields
Electric Field around a Conductor
EMF or Batteries
What quantity is represented by the symbol ?
1. Electronic potential
2. Excitation potential
3. Electromotive force
4. Electric stopping power
5. Exosphericity
What quantity is represented by the symbol ?
1. Electronic potential
2. Excitation potential
3. Electromotive force
4. Electric stopping power
5. Exosphericity
The electric field
1. is always perpendicular to an equipotential surface.
2. is always tangent to an equipotential surface.
3. always bisects an equipotential surface.
4. makes an angle to an equipotential surface that depends on the amount of charge.
The electric field
1. is always perpendicular to an equipotential surface.
2. is always tangent to an equipotential surface.
3. always bisects an equipotential surface.
4. makes an angle to an equipotential surface that depends on the amount of charge.
The relationship ∆V=IR is called
1. Faraday’s law.
2. Ampere’s law.
3. Ohm’s law.
4. Maxwell’s equation.
5. No name was given in this chapter.
The relationship ∆V=IR is called
1. Faraday’s law.
2. Ampere’s law.
3. Ohm’s law.
4. Maxwell’s equation.
5. No name was given in this chapter.
Energy concept
Force concept
Acts locally
Everywhere in space
Hand waving argument using a constant electric field
Recall from the last lecture we found
From Calculus III we find
Energy concept
Force concept
Acts locally
Everywhere in space
Calculating the potential from the electric field.
Or for one dimension
Recall
Kirchhoff’s Loop Law
The sum of the voltages aroung a closed path equal zero.
You should do this one.
Vector
so


You should do this one.
Which potentialenergy graph describes this electric field?
1. a
2. b
3. c
4. d
5. e
Which potentialenergy graph describes this electric field?
1. a
2. b
3. c
4. d
5. e
Which set of equipotential surfaces matches this electric field?
(1)
(2)
(3)
(5)
(4)
Which set of equipotential surfaces matches this electric field?
(1)
(2)
(3)
(5)
(4)
Gaussian surface
+
+
Three charged, metal spheres of different radii are connected by a thin metal wire. The potential and electric field at the surface of each sphere are V and E. Which of the following is true?
1. V1 = V2 = V3 and E1 = E2 = E3
2. V1 = V2 = V3 and E1 > E2 > E3
3. V1 > V2 > V3 and E1 = E2 = E3
4. V1 > V2 > V3 and E1 > E2 > E3
5. V3 > V2 > V1 and E1 = E2 = E3
Three charged, metal spheres of different radii are connected by a thin metal wire. The potential and electric field at the surface of each sphere are V and E. Which of the following is true?
1. V1 = V2 = V3 and E1 = E2 = E3
2. V1 = V2 = V3 and E1 > E2 > E3
3. V1 > V2 > V3 and E1 = E2 = E3
4. V1 > V2 > V3 and E1 > E2 > E3
5. V3 > V2 > V1 and E1 = E2 = E3
You should do this one.
A wire connects the positive and negative terminals of a battery. Two identical wires connect the positive and negative terminals of an identical battery. Rank in order, from largest to smallest, the currents Ia to Id at points a to d.
1. Ia =Ib =Ic =Id
2. Ia =Ib >Ic =Id
3.Ic =Id >Ia =Ib
4. Ic =Id >Ia >Ib
5. Ia >Ib >Ic =Id
A wire connects the positive and negative terminals of a battery. Two identical wires connect the positive and negative terminals of an identical battery. Rank in order, from largest to smallest, the currents Ia to Id at points a to d.
1. Ia =Ib =Ic =Id
2. Ia =Ib >Ic =Id
3.Ic =Id >Ia =Ib
4. Ic =Id >Ia >Ib
5. Ia >Ib >Ic =Id