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A coaxial cylinder of length L = 5 m consists of two cylindrical shells of radii a = 15 cm and b = 20 cm, respectively (see figure). The charge of the inner cylinder shell is Q = + 17.7 μC while the outer shell charge is Q = -17.7 μC. Find the electric field strength at: rc = 10 cm, rd = 18 cm, and re = 25 cm!
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