A planet has an electric field pointing toward its centre and having an average magnitude of about 1.2 × 10^2 N/C at its surface. (a) What is the sign of the charge on the planet? (b) What is the charge on the planet, assuming that all the charge is concentrated at the centre? This assumption is valid for a spherically symmetric object with a surface charge. The radius of the planet is 3.24 × 10^6 m.

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.