Aheat-conducting rod consists of an aluminum section, 0.30 m long, and a copper section, .70m long. both sections have a cross-sectional area of 4  · 10⁻⁴m² the aluminum end of the rod is maintained at a temperature of 10°c, while the copper end is maintained at 160°c. what is the temperature at the point where the aluminum and copper sections meet? the thermal conductivity of aluminum is 205 w/m ∙ k, and of copper is 385 w/m ∙ k. 77°c 60°c 71°c 65°c 55°c

To understand the electric potential and electric field of a point charge in three dimensions consider a positive point charge q, located at the origin of three-dimensional space. throughout this problem, use k in place of 14? ? 0. part adue to symmetry, the electric field of a point charge at the origin must point from the origin.answer in one word.part bfind e(r), the magnitude of the electric field at distance r from the point charge q.express your answer in terms of r, k, and q. part cfind v(r), the electric potential at distance rfrom the point charge q.express your answer in terms of r, k, and q part dwhich of the following is the correct relationship between the magnitude of a radial electric field and its associated electric potential ? more than one answer may be correct for the particular case of a point charge at the origin, but you should choose the correct general relationship. a)e(r)=dv(r)drb)e(r)=v(r)rc)e(r)=? dv(r)drd)e(r)=? v(r)r