(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A 3.3 μC point charge is on the x-axis at

x = 4.9 m, and a 3.9 μC point charge is on

the x-axis at x = 2.6 m.

The Coulomb constant is 8.98755 ×

109 Nm2/C2.

Determine the magnitude of the net electric

field at the point on the y-axis where y =

2.5 m.

Answer in units of N/C.

2. Relevant equations

The equation I'm using is kQ/r^2

k being Coulomb's constant

Q being my charge

r being the distance

3. The attempt at a solution

I'm not really sure how to approach this problem.

My first attempt was finding the electric field of each. One of the problems I had was that I did not know what distance to use so I just found the mid point of my two charges (3.75m) and used the pythagorean theorem ( sqrt((2.5^2)+(3.75^2)) ) to find my resultant, 4.5m. I'm positive this is where I went wrong.

9e9(3.9e-6)/4.5^2 = 1467.7 N/C

9e9(3.3e-6/4.5^2 = 1733.3 N/C

Found my x's and y's using 33.7 as my angle.

Subtracted the smaller number from the bigger to get my nets and used pythagorean theorem to get the resultant which ended up being 266.9 N/C which was not right.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Net electric field

**Physics Forums | Science Articles, Homework Help, Discussion**