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Q.

The charge per unit length for a very long straight wire is λ. The electric field at points near the wire and far from the ends varies with distance r as  E∝_____.

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a

1/r3

b

r

c

1/r2

d

1/r

answer is B.

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Detailed Solution

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E=λ2πε0r.

The electric field at points near the wire and far from the ends varies with distance r as inversely proportional to r.

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