Question

14)
A positive charge 50 uC is located in xy plane at
a position vector r' = 4i+4j. The electric field
strength E at a point whose position vector is
r"= 10i - 4j is (r'

and r" are expressed in metre)
​

Answer 1

i think it's right .......

45 ×10^-6 N/C

Answer 2

E=(9×10^9×50×10^-6)/10×10=4.5×10³N/C