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Lecture%2010%202220%20Spring%202009

# Lecture%2010%202220%20Spring%202009 - Physics 2220...

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1 Physics 2220 Announcements: HW 6 is due today HW 7 is due next Tuesday Exam 1 is a week from next Monday Help room (Physics 117) hours Help room (Physics 117) hours: Monday 4-8 pm Tuesday and Wednesday 3-6:30 pm Thursday 4:30-8 pm Friday 2-6 pm Turn in a piece of paper with name and responses if you don’t have your clicker with you today, or if you haven’t given me your clicker ID yet Capacitance of a Cylindrical Capacitor • From Gauss’s Law, the field between the cylinders is E = 2 k e λ / r Δ V = -2 k e λ ln ( b / a ) • The capacitance becomes () 2l n / e Q C Vkb a == Δ l Capacitance of a Spherical Capacitor • The potential difference will be 11 ⎛⎞ • The capacitance will be e Vk Q ba Δ ⎜⎟ ⎝⎠ e Qa b C Vkba Δ− Capacitance – Isolated Sphere • Assume a spherical charged conductor • Assume V = 0 at infinity 4 / o ee QQR C πε R Q Rk = = Δ Circuit Symbols • A circuit diagram is a simplified representation of an actual circuit • Circuit symbols are used to represent the various

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Lecture%2010%202220%20Spring%202009 - Physics 2220...

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