Question

A thin plastic rod of length 2.8 m is rubbed all over with wool, and acquires...

A thin plastic rod of length 2.8 m is rubbed all over with wool, and acquires a charge of 54 nC, distributed uniformly over its surface. Calculate the magnitude of the electric field due to the rod at a location 13 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.

(a) exact formula
E =  N/C
(b) approximate formula
E =  N/C

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Answer #1

a) The electric field due to the charged rod i:s, (9x109N㎡ /C2)(54x10°C) 13x10nm 2 (2.8 3738×102 N/C - 26.7x10 N/C b) The ele

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