A thin spherical shell of a 4.0 cm radius has a charge uniformly distributed on its surface. If the magnitude of the electric field at a point 10 cm radially outward from the center of the shell is 850 N/C, what is the surface charge density

be subject to a force andchange its motion

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =