An electric field can be created by a single charge or a distribution of charges. the electric field a distance r from a point charge q′ has magnitudee=k|q′|r2.the electric field points away from positive charges and toward negative charges. a distribution of charges creates an electric field that can be found by taking the vector sum of the fields created by individual point charges. note that if a charge q is placed in an electric field created by q′, q will not significantly affect the electric field if it is small compared to q′.imagine an isolated positive point charge with a charge q (many times larger than the charge on a single electron).part a

where's the following? you gotta add it to know what the choices are

explanation:

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

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im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.