It will bend at any load greater than zero. It is just a question of how much. In your example the rod will bend 0.007 inches under 10 pounds, 0.07 inches under 100 pounds, etc.
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That depends... on the composition of the steel !
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If you know the radius, double that to get diameter. If you have neither radius or diameter, then measure around the outside.
The diameter of a circle can be found without the circumference using the formula d = 2r. This formula requires that you know the radius of the circle which is half of the diameter. To calculate the diameter you need to multiply the radius by 2. For example if the radius of the circle is 4 then the diameter would be 8 (4 x 2 = 8).You can also find the diameter of a circle if you know the circumference. To do this use the formula c = d. By rearranging the equation you can calculate the diameter as d = c/. For example if the circumference of the circle is 12.5 the diameter would be 4 (12.5/ = 4).
Use the diameter and divide it by two.