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Calculate the electric potential at point P on the axis of the annulus shown below, which has a uniform charge density ?.

Directions: Read and analyze the problem carefully. Solve the following problems with solutions.
Problem-solving:
1. Calculate the electric potential at point P on the axis of the annulus shown below, which has
a uniform charge density o.
2. The spherical dome of a Van de Graaff generator can be raised to a maximum potential of
600 kV: then additional charge leaks off in sparks, by producing dielectric breakdown of the

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