A positive charge is released from rest at point P and is found to gain of kinetic…
PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
A 3C positive charge is released from rest at point P and is found to gain 24J of kinetic energy when it reaches point Q.
(i) Taking the charge movement as the positive direction P→Q, calculate the work done by the electric field per unit charge.
(ii) Hence find the potential difference VQP between points Q and P, including its sign.
(iii) If an external agent now slowly moves the same 3C charge from Q back to P, how much work must the agent do? State whether this work is positive or negative and give a reason.