Question: 1. Two concentric spherical shell conductors carry equal and opposite charges. The inner shell has radius a and charge +q; the outer shell has radius

1. Two concentric spherical shell conductors carry equal and opposite charges. The inner shell has radius a and charge +q; the outer shell has radius b and charge –q. Find the potential difference between the shells, Va – Vb.

2. When you touch a friend after walking across a rug on a dry day, you typically draw a spark of about 2 mm. Estimate the potential difference between you and your friend before the spark.

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