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Part 1) Many molecules that are electrically neutral overall have one side that is charged slightly negative and one side that is charged slightly positive.

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Part 1) Many molecules that are electrically neutral overall have one side that is charged slightly negative and one side that is charged slightly positive. Such a pair of particles ls called an electric dipole. and their behavior is important in many biological systems. One classic exempts to salt (NaCl). It consists of a positive sodium ion (Na') and a negative chloride ion (Ci'). NaCl can be modeled as a pair of point charges +1] and - q (where q = r: = I.6x10"" C) separated by a small distance of d = 10\"\" m. o d Would a charged object exert an electrostatic force on an electric dlpoie like this. even though the dipole is overall neutral? To investigate this question, suppose you have 3 NaCl molecule and a proton (p) with charge +e = 1.61:10'19 C. The CI' ion is a distance R from the proton and the Na' ion is a distance R + d from the proton. R It .. _.. ._.. a Na" d A onsider the N36! molecule as a single object. Draw a free-body diagram for the forces on the molecule from the proton. Label the force from the proton on the cr ion as Fp_Ci and the force from the proton on the Na\" ion as FR\". {4 pants) gating the tree-body diagram you drew write down an expression tor the net tom on the proton in terms of k. R. d. and 9 (Remember that the merge on a proton is tr) Your answer should be a sum or difterenoe of two terms is this no! 'orcn attract-w ur repulsive? (4 points) Fner : C) Now assume R = 1 mm and calculate the magnitude 0* the net EQCL'CSSL'C 'crce on the dipole by the preten. Note: some calculators can have m got-mm; no numbers that are so similar. When you're In this situation. it s best ['3 gure cu another way to anange your variables. One took is to con-tome m cm a mom denominator. another is to use a very preCIse onttne amateur '60er w 17 [y '4 points)

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