Use Hooke's Law to determine the work done by the variable force in the spring problem. Nine joules of work is required to stret
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The electric potential energy of the electron depends on the potential difference applied between the two ends of the cable. Indeed, the electric potential energy of a charge is given by
where q is the magnitude of the charge, while
is the potential difference applied. So, U depends on .
where q is the magnitude of the charge, while