lecture13

# Lecture13

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Unformatted text preview: Session 2 - C. Palmer ˆ B = − B0 z August 21, 2013 38 Mass Spectrometer Part 1: Velocity Selector Mass What directions are the electric and magnetic forces? A)  FB in +x; FE in +x B)  FB in +x; FE in –x FB C)  FB in –x; FE in +x D)  FB in –x; FE in –x y z x Physics 2B - Summer Session 2 - C. Palmer FE ˆ B = − B0 z August 21, 2013 39 Mass Spectrometer Part 1: Velocity Selector ∑ Fi = ma Newton’s 2nd Law Balance means acceleration is 0 ∑ Fi = FE + FB = 0 ˆ ˆ = qE0 x + qvB0 ( − x ) = 0 FB y z x Physics 2B - Summer Session 2 - C. Palmer FE ˆ B = − B0 z August 21, 2013 40 y Mass Spectrometer Part 1: Velocity Selector ∑ Fi = ma z x Newton’s 2nd Law Balance means acceleration is 0 ˆ ˆ qE0 x + qvB0 ( − x ) = 0 Only particles with THIS velocity will make it through E0 v= B0 Physics 2B - Summer Session 2 - C. Palmer FB FE ˆ B = − B0 z August 21, 2013 41 Mass Spectrometer Part 2: Determining Particle charge to mass. The grey slit is a hard wall. What will the motion of the particle be when the particle enters the slit? A)  The particle will enter into y endless circular motion. B)  The particle will make a semi-circle to the LEFT before crashing into the wall. C)  The particle will make a semi-circle to the RIGHT before crashing into the wall. Physics 2B - Summer Session 2 - C. Palmer + z August 21, 2013 x ˆ B = − B1z 42 Mass Spectrometer Part 2: Determining Particle charge to mass. The grey slit is a hard wall. What will the motion of the particle be when the particle enters the slit? A)  The particle will enter into y endless circular motion. B)  The particle will make a semi-circle to the LEFT before crashing into the wall. C)  The particle will make a semi-circle to the RIGHT before crashing into the wall. Physics 2B - Summer Session 2 - C. Palmer + z August 21, 2013 x ˆ B = − B1z 43 Mass Spectrometer Part 2: Determining Particle y charge to mass. When you exam the crash site you find r. v qvB1 = m r m rB1 ⇒= q v Physics 2B - Summer Session 2 - C. Palmer ˆ B = − B1z + 2 z x August 21, 2013 44 Mass Spectrometer Part 2: Determining Particle y charge to mass. When you exam the crash site you find r. Recall the velocity selector allowed only one velocity through. ˆ B = − B1z + m rB1 rB1B0 = = q v E0 Physics 2B - Summer Session 2 - C. Palmer z x August 21, 2013 45...
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## This note was uploaded on 09/10/2013 for the course PHYS 2B 2b taught by Professor Hirsch during the Summer '10 term at UCSD.

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