What type of device uses an electromagnet to convert electrical energy into mechanical energy?
a.
motor
b.
generator
c.
transformer
d.
amplifier
e.
battery

A. motor

Motor uses an electromagnet to convert electrical energy into mechanical energy.

Explanation:

Electrical engines adhere to one side hand rule. As indicated by Fleming's left-hand rule, the thumb, index finger and the center finger are extended commonly opposite to one another.

At that point, if the pointer demonstrates the bearing of the attractive field, the center finger shows the course of the present as attractive field and current travel commonly opposite to one another, at that point, the thumb will speak to the heading of power or movement.

So as indicated by this standard, the electromagnet present in an electric engine will deliver an attractive and electric field a commonly opposite way and because of these fields, the pole will pivot prompting mechanical power.

In this way, the electrical vitality delivered by the electromagnet is changed over to mechanical vitality in an electric engine.

gas and liquid

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 =