PHY122_ReviewForMidtterm2onThurs27OctoberForPosting

PHY122_ReviewForMidtterm2onThurs27OctoberForPosting -...

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PHY122 – Physics for the Life Sciences II Review Chapters 24-26 Note: Clicker Channel 21 10/27/2011 Review Midterm 2 1
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M2 Formulae 10/27/2011 Review Midterm 2 2
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M2 Formulae 10/27/2011 Review Midterm 2 3
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M2 Formulae 10/27/2011 Review Midterm 2 4
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M2 Formulae 10/27/2011 Review Midterm 2 5
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M2 Formulae 10/27/2011 Review Midterm 2 6
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Midterm 2 – When and Who Goes Where? • Date/Time: Monday , 31 Oct , 8:30pm Monday , 31 Oct , 8:30pm Monday , 31 Oct , 8:30pm Monday , 31 Oct , 8:30pm – 10:00pm 10:00pm 10:00pm 10:00pm • Room: Based on your Registered Registered Registered LAST NAME 10/27/2011 Review Midterm 2 7 LAST Names starting with: Room A – D JAVITS 111 E – R JAVITS 102 S – Z HUM 1006
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Superconductivity and Critical Field The element niobium, which is a metal, is a superconductor (i.e. has zero resistance) at temperatures below 9 K. However, the superconductivity is destroyed if the magnetic field at the surface of the metal reaches or exceeds the critical field B crit = 0.10 T . – What is the maximum current in a straight, D = 4.0 mm diameter superconducting niobium wire? 10/27/2011 Review Midterm 2 8 Long straight wire: G = ± ² ³ 2´µ ⟹ ³ ¶·¸¹ = (2´)(µ = º/2)(G ¶·¸¹ ) ± ² = = 2 ´ 2.0 × 10 »¼ m 0.1 T 4´ × 10 »½ Tm/A = 1,000 A BEWARE: given dia. D in mm NOT the radius R in m ; need B crit at r = D/2
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Force between straight, current-carrying wires 10/27/2011 Review Midterm 2 9 The figure shows three straight, parallel wires a, b, c that are in the plane of the paper and have equal lengths. A distance d separates wire a and wire b , and the same distance d separates wire b and wire c . A current I flows “down” in wire a, an equal current I flows “down” in wire c , and a current 0.5I flows “up” in wire b. (NOTE: Multiple-correct –answer questions such as this will not be on Midterm 2.) A. Wires a and c are attracted to each other . T B. Wires a and b are attracted to each other. F C. The force between wire a and wire b , the force between wire b and wire c , and the force between wire a and wire c all have the same magnitude. T D. Wires b and c are attracted to each other. F
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A Proton in a Uniform Magnetic Field At t= 0 a proton is moving with a speed v= 5.0 × 10 5 m/s at an angle of θ = 30 ° from the x -axis. A uniform magnetic field B= 1.5 T is pointing in the positive y -direction. – What will be the
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