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UF PHY 2054 - Physics II

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PHY 2054: Physics II HITT, please contact and inform in case of problems Hopefully all webassign problems have beensolved. Please see me immediately after the class if there is still an issue. SI for T6 meeting, the room has been changed from MCCB 2102. New room MCCB 3108PHY 2054: Physics II Some effects of potentials and potential energy. Parallel and Series configurations for capacitors.HITT I An ion is released from rest and moves due to the force from an electric field from a position in the field having a potential of 14 V to a position having a potential of 8 V. The ion:a. must have a positive charge.b. must have a negative charge.c. can have either a positive or a negative charge.d. must be neutral.Some old business:What is the electric fieldof a shellof a uniform spherical charge distribution?What is the potential for each of the above?The story of the integration constant.PHY 2054: Physics II∫∞−=<=<<−−=>=rrdrErVRrRrRRRRrrkqRrrkqE.)(01213132313222V(∞) = 0This one takes effort but can be done.⎥⎥⎦⎤⎢⎢⎣⎡⎟⎠⎞⎜⎝⎛−=>=−=∞−<=>=∫∞23232.)()(RrRkqRrrkqdrEVrVRrrRkqRrrkqErrPHY 2054: Physics IIEVVrROptions: V(∞) = 0 V (0) = 0PHY 2054: Physics II q1= q, q2= -4q, q3= +2q d=.12 , q = 150 nC The system has to be held. If let go, would it implode or fly apart.PHY 2054: Physics II q1= q, q2= -4q, q3= +2q d=.12 , q = 150 nC The system has to be held. If let go, would it implode or fly apart.The potential energy = - 10kq2/dit implodesHITT II An electron with velocity v= 1.0 × 106m/s is sent between the plates of a capacitor where the electric field is E= 500 V/m. If the distance the electron travels through the field is 1.0 cm, how far is it deviated (Y) in its path when it emerges from the electric field? (me= 9.1 × 10−31kg, e= 1.6 × 10−19C) a. 2.2 mm b. 4.4 mm c. 2.2 cm d. 4.4 cmY1 cmvPHY 2054: Physics II q = CV C = εoA/d 1F = 1Coulomb/VoltPHY 2054: Physics II()abLCCqLrkqdrbVaVLrkqEbaln22)()(20πε===−=∫PHY 2054: Physics II In Parallel Total charge  q = q1+ q2+ q3=(C1+ C2+ C3)V C = C1+ C2+ C3PHY 2054: Physics II Series: the charges are same, potentials add. V = V1+ V2+ V33211111CCCC++=PHY 2054: Physics II213111CCCC ++=HITT III What is the equivalent capacitance between points aand b? All capacitors are 1.0 μF.  a. 4.0 µF b. 1 7 µF c. 0.60 µF d. 0.25 µF abPHY 2054: Physics II Potentials are always measured in difference. This avoids the choice of the integration constant. Capacitors are charge holders. Their ability to hold charge is measured by C. Their true “capacity” is called breakdown strength. C = εox length, Thus 10 cm leads to 1 pF.PHY 2054: Physics II About bicycle riding: If some one shows you a trick, it means that, It is possible to do that trick The person who showed you, can do the trick.  It does not mean that you can do the trick. Try it a lot of times and you can too.PHY 2054: Physics II()()()⎟⎟⎠⎞⎜⎜⎝⎛+−=∂∂−=−+====+2222'''2122''222RzzzVEzRzkrdqkdVdRRdqozozRdRRεσεσπσπσPHY 2054: Physics II Gold, 79p,118n α : 2p,2n Approach = 9.23 x 10-15 m Initial kinetic energy = 24.6 MeVPHY 2054: Physics II()()[]⎥⎥⎦⎤⎢⎢⎣⎡++=++=+==∫ddLLkdxxkdxdxkrdqkVLL2202202/122lnlnλλλWhat happens if the point P is not at the end of the


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UF PHY 2054 - Physics II

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