A thin plastic rod of length 2.8 m is rubbed all over with wool, and acquires a charge of 84 nC, distributed uniformly over its surface. Calculate the magnitude of the electric field due to the rod at a location 9 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.

b.

explanation:

10.0

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