A spherical shell of radius R1=10 cm carries a total charge q1=15 C that is uniformly distributed on its surface. A second, larger spherical shell of radius R2=23 cm that is concentric with the first carries a charge q2=2 C that is uniformly distributed on its surface. Calculate the strength of the electric field at r=14 cm. (Your result must be in multiples of 1013 N/C. That means if, for example, you get a result of 9.22 x 10" just type 9.22 in the answer box. Include 2 digits after the decimal point and maximum of 2% of error is accepted in your answer. Take k=9x10.)