An infinitely long nonconducting cylinder of radius r = 2.00 cm carries a uniform volume charge density of 18.0 micro-coulomb/cubic meter. calculate the electric field at distance r = 1.00 cm from the axis of the cylinder

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17 a tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. however, he found that if he increases the speed by 20 km/h he can cover the same distance in 30 minutes less time than it was planned. what was the planned speed of the tourist, in km/h?

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