How do machines increase mechanical advantage?

Like a key in a lock, the shape of the. must bind with the. of the recieving neuron

Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? express your answer in terms of some or all of the variables s, q1, q2 and k =14ï€ïµ0. if your answer is difficult to enter, consider simplifying it, as it can be made relatively simple with some work.

Match each scenario to the form of energy it represents