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Question

Which of the following graph shows curve between electric field (E) versus distance (r) from infinite line charge having constant positive charge density.

A
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B
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C
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D
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Solution

The correct option is D
We know that, due to infinite line charge of constant linear charge density (λ),

EII=0 and E=2kλr

So, Enet=E2II+E2=2kλr

since, k and λ are constant.

Enet=Constantr

Enetr=constant

On taking Enet at y axis and r at x axis, we get

xy=constant

This is the equation of rectangular hyperbola.

Therefore, the curve between E and r is a rectangular hyperbola.

Hence, option (d) is correct.

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