lecture14

# lecture14 - L ecture 14 E xam 2 R edux C harged Particle...

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Lecture 14: Exam 2 Redux Charged Particle Motion Force on Wires Biot-Savart Law

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Remember Grades are curved One exam is dropped Average – 8.9 Standard Dev – 3.0 August 26, 2013 2 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer
Remember Grades are curved One exam is dropped Average – 8.9 Standard Dev – 3.0 August 26, 2013 3 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer A B C Danger Zone

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Electric potential is a continuous function Integration of chunk of charge to find total potential Finding capacitance between 2 spheres Mainly determining the potential and the potential difference Charge on a single capacitor in a group of capacitors Need to understand the relationship between charge/voltage in the equivalent capacitor and the original circuit. August 26, 2013 4 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer
Physics Concept Components Learning Outcome Magnetic Force and Field Charged particle motion Induced EMF Faraday’s Law Lenz’s Law Self inductance Ampere’s Law Mutual inductance Evaluate the force on and simple motion of a charged object in a magnetic field Evaluate the force on wires Evaluate the magnetic fields from wires Predict the effects of a varying magnetic field on conductors (especially wires). Compute algebraic expressions for magnetic fields using Ampere’s Law August 26, 2013 5 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer

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This is the key equation. August 26, 2013 6 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer y x z + + + + qvB 0 = m v 2 r
Mass Spectrometer Part 1: Velocity Selector Newton’s 2 nd Law Balance means acceleration is 0 Only particles with THIS velocity will make it through August 26, 2013 7 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer y x z B = B 0 ˆ z F B F E F i = m a qE 0 ˆ x + qvB 0 ˆ x ( ) = 0 v = E 0 B 0

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Mass Spectrometer Part 2: Determining Particle charge to mass. When you exam the crash site you find r. August 26, 2013 8 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer y x z B = B 1 ˆ z + Recall the velocity selector allowed only one velocity through. m q = rB 1 v = rB 1 B 0 E 0
In the picture there are two particles that hit the wall. Assume they have the same charge, what can you say about their masses? A) A has greater mass. B) B has greater mass. C) They have the same mass. D) Need more info. August 26, 2013 9 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer m q = rB 1 B 0 E 0

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In the picture there are two particles that hit the wall. Assume they have the same charge, what can you say about their masses? A) A has greater mass. B) B has greater mass. C) They have the same mass. D) Need more info. August 26, 2013 10 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer m q = rB 1 B 0 E 0
Device used to accelerate charged objects The dee’s Made of metal (copper here) Electric field inside is 0 Uniform magnetic field Between the dee’s there is a potential difference to accelerate the charge particles Must alternate electric potential in order always accelerate and not decelerate August 26, 2013 11 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer

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