Which Spring Constants to Use for Magnet Oscillation Experiment?

[Boileddog]

For my academic research project, I am studying the oscillatory of magnets attached to extension springs. And to have variety of data on different types of oscillation, I'll be using different spring constants as a variable. But in order to get the springs I need to know the dimensions of the specific springs. Therefore, what are the 10 different spring constants that I should have for ascendingly varying oscillations of spring for a load of around 40 grams?

 

[kuruman]

For my academic research project, I am studying the oscillatory of magnets attached to extension springs.

Please be more specific. What exactly is the "oscillatory of magnets attached to extension springs"? Are you talking about the frequency of oscillations in vertical spring-mass systems? If so, why use magnets and not plain weights? What are you going to measure? In projects of this kind, one asks a question and then designs a procedure to answer it. What question, specifically, are you asking?