+33661 Imagine you are at a value of r that is much greater than R2. All you will be able to see is a point that has total charge q + Q.
Of course, you need to convince yourself that even when you are close to the outside of the spherical shell, the electric field is still the same as if the charge were all concentrated at the centre of the shell. See http://farside.ph.utexas.edu/teaching/302l/lectures/node25.html to take you through the argument.
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+33661 Imagine you are at a value of r that is much greater than R2. All you will be able to see is a point that has total charge q + Q.
Of course, you need to convince yourself that even when you are close to the outside of the spherical shell, the electric field is still the same as if the charge were all concentrated at the centre of the shell. See http://farside.ph.utexas.edu/teaching/302l/lectures/node25.html to take you through the argument.
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