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Question
The intensity of the electric field at a perpendicular distance of 0·5 m from an infinitely long line charge having linear charge density (λ) is 3-6 × 103 Vm-1. Find the value of λ.
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Solution
λ =n E.2π∈0r where E =3.6 ×103 Vm-1, R= 5m
∴ λ = 3.6 × 103 ×05 ×2 ×3.14 × 8.85 ×10-12
= 3.6 × 103 ×3.14 ×8.85 ×10-12
= 100× 10-9
=10-7 Cm-1
∴ λ = 10-7 Cm-1
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