Which of the following choices of path allow you to use Ampère’s law to analytically find B⃗ (r⃗ )B→(r→)? A) The path must pass through the point r⃗ r→r_vec. B) The path must have enough symmetry so that B⃗ (r⃗ )⋅dl⃗ B→(r→)⋅dl→ is constant along large parts of it. C) The path must be a circle.

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

dang that balls went far

because if the tool that you are using is not balanced it there would be false mass.