Will two charged objects (sticky tape) create electric force fields that allow them to interact without touching

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.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

at right angles to each other