PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
A point charge +6μC is fixed at the origin O. A second point charge −3μC is fixed on the y-axis at P(0,0.30m).
(i) Determine the position(s) on the y-axis where the electric potential is zero.
(ii) A test charge +1μC is placed at the point found in part (i). Calculate its electric potential energy with respect to infinity.
(iii) Comment on the stability of the test charge at that position by referring to the nature (sign) of the charges involved.