Athin plastic rod of length 2.5 m is rubbed all over with wool, and acquires a charge of 75 nc, distributed uniformly over its surface. calculate the magnitude of the electric field due to the rod at a location 7 cm from the midpoint of the rod. do the calculation two ways, first using the exact formula for a rod of any length, and second using the approximate formula for a long rod.
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Athin plastic rod of length 2.5 m is rubbed all over with wool, and acquires a charge of 75 nc, dist...
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