Can anyone give me a DETAILED explanation to this problem? A charge -1.1 × 10-5

Question

Can anyone give me a DETAILED explanation to this problem?

A charge -1.1 × 10-5 C is fixed on the x-axis at 7 m, and a charge 1×10-5 C is fixed on the y-axis at 5 m.
Calculate the magnitude of the resul- tant electric field E? at the origin.
Answer in units of N/C

Calculate the electric potential at the origin.

Answer in units of V

A 5 × 106 C charge is brought from a very distant point by an external force and placed at the origin.

Calculate the magnitude of the elec- tric force on this charge.

Answer in units of N

Calculate the work that had to be done by an external force to bring Q to the origin from the distant point.

Answer in units of J

THANK YOU SOOO MUCH! 

Explanation / Answer

magnitude of net field at origin = field due to one charge + field due to other charge at origin field due to x-axis charge = k*-1.1 × 10-5 /49 =x lets say field due to y-axis charge = k*1×10-5 /25 = y lets say but these two fields are perpendicualr to each other hence vector addition suggests that magnitude will be sqrt( x^2 + y^2) note that k = 9 x 10^-9 substitute the values to get teh answer

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