Physics – Classical Physics
Scientific paper
2010-03-22
Physics
Classical Physics
6 pages, 4 figures
Scientific paper
The classic image problem in electromagnetism involves a grounded infinite conducting plane and a point charge. The force of attraction between the point charge and the plane is identified using an equivalent-field picture of an image charge with opposite sign equidistant behind the plane resulting in a 1/{\it r}$^{\rm 2}$ force of attraction between the original charge and the plane. If the point charge is released from rest it will reach the plane in a time $\tau$. This time $\tau$ has not been calculated correctly up to now. Clarification of the inconsistency is presented along with a correct solution to the classic image problem. Other electromagnetism problems are mentioned with attractive 1/{\it r}$^{\it n}$ forces (where {\it n} $\ge$ 1). Such situations arise between a point charge and a line charge (1/{\it r}), between a line charge and a point dipole (1/{\it r}$^{2}$), between a point charge and a point dipole (1/{\it r}$^{3})$, and between a point dipole and a second point dipole (1/{\it r}$^{4}$).
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