Ok. I understand like repel and opposite attract. There are these physics homework with 3 charges and find the force from 2 of them on one. I understand the math: the only problem is my signs are wrong due to not understanding the direction of the force.
For example,
There's a positive...
An insulating sphere with a radius of (3.3E-2) m has a uniform charge density of (6.74E-6) C/m^3 throughout its volume.
(1)Find the magnitude of the electric field at a point (5.7E-2) m from the center of the sphere.
(2) Find the magnitude of the electric field at the surface of the...