Question: How can I find studs inside a finished wall in my home?

  Options: 
 A. Use a powerful magnet, run it over the wall, when the magnet finds something to attract it and catches it that means you have located a nail in the wall (or drywall) and a stud is directly to the right of it 5 inches.
 B. Use a powerful magnet, run it over the wall, when the magnet finds something to attract it and catches it that means you have located a nail in the wall (or drywall) and a stud is directly behind there.
Answer: B