3. Does a wire with a current running through it
have an electric field, a magnetic field, or
both? Explain how you know.

as net charge of a current carrying conductor is zero so no electric field is associated with at.

And

as moving charges give rise to magnetic field so magnetic field is associated with it

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

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 =