A Uniform Linear Charge Density of 7 $\int _ { 2 } ^ { 5 } \frac { 63 d y } { y ^ { 2 } }$

Multiple Choice

A uniform linear charge density of 7.0 nC/m is distributed along the y axis from y = 2 m to y = 5 m.Which of the following integrals is correct for the magnitude (in N/C) of the electric field at y = 0 on the y axis?

A) $\int _ { 2 } ^ { 5 } \frac { 63 d y } { y ^ { 2 } }$
B) $$\int _ { 2 } ^ { 5 } \frac { 21 d y } { y ^ { 2 } }$$
C) $\int _ { 2 } ^ { 5 } \frac { 63 d y } { ( 5 - y ) ^ { 2 } }$
D) $\int _ { 2 } ^ { 5 } \frac { 21 d y } { ( 5 - y ) ^ { 2 } }$
E) none of these