Asolid, rectangular iron bar measures 0.40 cm by 3.0 cm by 15 cm . part a find the resistance between opposing faces with crosssectional area 0.40 cm × 3.0 cm , assuming the faces in question are equipotentials. express your answer using two significant figures. r r = nothing ω submitrequest answer part b find the resistance between opposing faces with crosssectional area 0.40 cm × 15 cm , assuming the faces in question are equipotentials. express your answer using two significant figures. r r = nothing ω submitrequest answer part c find the resistance between opposing faces with crosssectional area 3.0 cm × 15 cm , assuming the faces in question are equipotentials. express your answer using two significant figures. r r = nothing ω submitrequest answer provide feedback next g