Describe three safety procedures you should always follow when conducting a scientific investigation.

(1) Follow the instruction.

(2) Know the location of safety instrument.

(3) Lab dress.

Explanation:

There are the three procedures we can take follow when conducting a scientific investigation:

(1) Follow the instruction: It is the most important procedure while performing any scientific investigation. Whether you listen to the lab attendent instruction, or your supervisor instruction, or the instruction which are given in the book. It is very important.

(2) Know the location of safety instrument: If any instrument is not working properly, it is very important to know the safety location of that instrument and it is quite important to know that some instrument is working or not.

(3) Lab dress: It is very important thing while doing  an investigation. We should wear lab coats and gloves because gloves will protect you from any contact with the chemical, which will give serious injuries like hand burns.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.