Strength of the electric field: E = k Q / d² k = 8.99 · 10 ^9 d 1 = 5 cm = 0.05 m Q 1 = 3 n C = 3 · 10 ^(-9) C E 1 = 8.99 · 10^9 · 3 · 10 ^(-9) C / ( 0.05 m )² = 10,788 N / C E 1 = 10,788 i + 0 j d 2² = √ (5² + 10²) =√ 125 = 11.18 cm = 0.1118 m E 2 = 8.99 · 10 ^9 · 3 · 10^(-9)C / ( 0.1118 m )² = 2,157 N/C Angle: cot^(-1) ( 5/10 ) = cot^(-1) 0.5 = 63.43° E 2 = cos 63.43° · 2,154 i + sin 63.43° · 2,154 j E 2 = 963.46 i + 1,927.02 j E = E 1 + E 2 = 11,731.46 i + 1,927.02 j = √ (11,731.46² + 1,927.02² ) = 11,888 N/C α = tan^(-1) ( 1,927.02/11,731.46) = tan^(-1) 0.1643 = 9.33° above the horizontal.