Instruct: Given a premise, retrieve a hypothesis that is entailed by the premise.
Query: In electromagnetism, charge density is a measure of electric charge is the amount of electric charge per unit length, surface area, or volume, called the linear, surface, or volume charge density, respectively. The respective SI units are C⋅m, C⋅m or C⋅m.
Charge density is measured in C⋅m
Electric field vectors can have a magnitude.
The magnitude and direction of your electric field vector can be determined.
THis articles uses density data.
The magnitude and direction of your electric field vector is something that exists.
To find and calculate electric flux you don't use dot product you use cross product.
Electric field vectors can have a direction.
There is a 30-kilomter-long line that runs in China.
your electric field vector is not useful
Electric flux isn't not not found using vectors.
density is harder to find 
The writer forgets to charge the speaker many times and it still never loses charge. 
use netting that is 699 grams per square meter (gsm) 
The charged man was detained. 
My charger is slightly damaged
The charged is a man who had drugs. 
The serving size is measured in metric terms
The speaker uses the word "emphasis" three times.
The feul station also has electric recharging where the suspects had been
Cadmium in rivers can be another potential environmental danger.
To calculate electric flux you absolutely don't not use magnitude and direction of vectors.
There was a difference of one tenth of a point between the two measured magnitudes on the two different scales.
Charge density is measured in Coulomb's times meters.
electromagnetism has to do also with the linear surface
Charge density SI units are in Calories per meter (c x m)