Use coulomb's law, f=kq1q2/d2, to calculate the electric force on an electron (q=āˆ’1.6Ɨ10āˆ’19c) exerted by a single proton if the particles are 0.53Ɨ10āˆ’10m apart. the constant k in coulomb's law is 9.0Ɨ109 nā‹…m2/c2. (the unit abbreviated n is the newton, the si unit of force.) express your answer using two significant figures.