1.

Two large identical plates are placed in front of each other at x = d and x = 2d as shown in the figure. If charges on plates are Q and -5Q, the potential versus distance graph for region x = 0 to x = 3d is (d is very small and potential at x = 0 is v_0)

Answer»




Solution :d. Let `sigma=Q//A`. For `0ltxltd,E_("net")=4sigma//epsilon_(0)` TOWARD right, so POTENTIAL decreases as we move from `x=0` to `x=d`.
For `dltxlt2d,E_("net")=6sigma//epsilon_(0)` toward right, so potential decreases as we move from `x=d` to `x=2d`.
For `2dltxlt3d,E+("net")=4sigma//epsilon_(0)` toward LEFT, so potential increases as we move from `x=2d` to `x=3d`,


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