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Q.

Two infinitely long line of charge carrying charges +λCm  and  -λCmare kept at a separation r. Then the electric field at a distance r from each line of charge is

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a

22λπ∈0r

b

λπ∈0r

c

λ2π∈0r

d

λ/2π∈0r

answer is C.

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Detailed Solution

E1=E2=λ2π∈0r∴ EP2=E12+E22+2E1E2cos120o=E12+E12+2E1.E1.−12⇒EP=E1=λ2π∈0r
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