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Question

A charge Q is distributed uniformly along a rod of lengths L. The electric field at a distance ‘d’ along its axis from its closer end will be


A
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B

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C

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D

None of these

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Solution

The correct option is B


Alright! So the electric field due to a line of charge of length L at a point on its axis, at a distance r from the Centre of the rod is

E=KQr2L2/4

If you don’t remember this then it’s okay! You don’t have to mug stuff up. I recommend you to watch try the derivation once and then watch the derivation video once again!

here the value of r is d + L2 (as r is the distance from the Centre). Substituting that in the aforementioned equation we get

E=KQd2+dL


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