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Reading Quiz

Reading Quiz. 2. What is the SI unit of capacitance? Capaciton Faraday Hertz Henry Exciton. What quantity is represented by the symbol ? Electronic potential Excitation potential EMF Electric stopping power Exosphericity. 4. This chapter investigated

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Reading Quiz

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  1. Reading Quiz • 2. What is the SI unit of capacitance? • Capaciton • Faraday • Hertz • Henry • Exciton • What quantity is represented by the symbol ? • Electronic potential • Excitation potential • EMF • Electric stopping power • Exosphericity

  2. 4. This chapter investigated • parallel capacitors • perpendicular capacitors • series capacitors. • Both a and b. • Both a and c. • 3. The electric field • is always perpendicular to an equipotential surface. • is always tangent to an equipotential surface. • always bisects an equipotential surface. • makes an angle to an equipotential surface that depends on the amount of charge.

  3. What quantity is represented by the symbol ? • Electronic potential • Excitation potential • EMF • Electric stopping power • Exosphericity

  4. What is the SI unit of capacitance? • Capaciton • Faraday • Hertz • Henry • Exciton

  5. The electric field • is always perpendicular to an equipotential surface. • is always tangent to an equipotential surface. • always bisects an equipotential surface. • makes an angle to an equipotential surface that depends on the amount of charge.

  6. This chapter investigated • parallel capacitors • perpendicular capacitors • series capacitors. • Both a and b. • Both a and c.

  7. Finding the Potential from the Electric Field The potential difference between two points in space is where s is the position along a line from point i to point f. That is, we can find the potential difference between two points if we know the electric field. We can think of an integral as an area under a curve. Thus a graphical interpretation of the equation above is

  8. EXAMPLE 30.2 The potential of a parallel-plate capacitor

  9. EXAMPLE 30.2 The potential of a parallel-plate capacitor

  10. EXAMPLE 30.2 The potential of a parallel-plate capacitor

  11. Finding the Electric Field from the Potential In terms of the potential, the component of the electric field in the s-direction is Now we have reversed Equation 30.3 and have a way to find the electric field from the potential.

  12. EXAMPLE 30.4 Finding E from the slope of V QUESTION:

  13. EXAMPLE 30.4 Finding E from the slope of V

  14. Exam 1 Review • Chapters 26 – 30 • Up to and including section 30.4 • The exam won’t cover sections 30.5 to the end of the chapter • The exam will cover • Field lines and surfaces of equipotential for different charge configurations • Force and Electric Field of point charges • Potential and Potential Energy of point charges • Using Gauss’ Law to determine something about field or charge

  15. Group Problems • Start Ch 29 HW • Chapter 30 HW may be on exam (topics up to and including those covered in Sections 30.1 – 30.4)

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