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Question

The ideal Gaussian surface for an infinite rod should be

A
concentric rings
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B
a coaxial cylinder
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C
concentric shells
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D
concentric spheres
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Solution

The correct option is B a coaxial cylinder
A gaussian surface should be such that the electric field intensity at all points on its surface is same. So, for an infinite rod, the gaussian surface should be a coaxial cylinder. Choosing this as a gaussian surface also avoids the calculus while calculating the electric field using Gauss Law.

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