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CU-Boulder PHYS 2020 - Exam 3 Review

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RI-1Phys2020 Exam 3 Review:Magnetism- Currents cause magnetic fields (B-fields) - B BF F q v B sin q v B^= = q =r "right-hand-rule" - When both E-field and B-field are present:{tot E Bq EF F F= +rr r r- B-field due to long straight wire: 0IB2 rm=p- "modified right-hand rule" point thumb in directionof straight thing, fingers curl in sense of circular thing.- B-field is a vector: tot 1 2B B B= +r r r- Force on a current-carrying wire: {on wireif I, B F I L B sin I L B^= q = - parallel currents attract; anti-parallel currents repel- solenoid or permanent magnetFaraday's Lawnet atomic current on rimuniformB(out)atomic current on rim,like solenoidSide View:End View:NSB-field comesout of "North" endB-field enters"South" endI BRI-2- An emf (= battery voltage) is caused by a changing magnetic flux:( N loops)NtDF= -DE ( where- is the flux through 1 loop)magnetic flux B A^F =- Lenz's Law: Iinduced creates Binduced in direction that opposes change in flux.- Motors and generators- Eddy current forces always oppose the motion- Transformers only work for changing voltages (AC voltages) out S Sin P PV V NV V N= =Pout - Pin - IS VS = IP VP - SP PP S SIV NI V N= =EM Waves- Light is an electromagnetic wave which is created by accelerating electric charge.- f c speed of light = constantl = =, EM spectrum (radio, visible, IR, UV, etc)- 2power Pintensity (W/m ) = , Iarea A=Ray Optics- Snell's Law: 1 1 2 2n sin n sinq = q , where index of refraction = cnv=- total internal reflection, critical angle -C : o1 c 2 21n sin n sin(90 ) nq = =144424443- Converging and diverging lenses , focal length- Ray diagrams, image formation, real vs. virtual imagesf > 0f < 0RI-3- Camera vs. eye- image/object math: o i1 1 1f d d= + , i io oh dMh d�


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CU-Boulder PHYS 2020 - Exam 3 Review

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