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Q.

A semicircular arc of radius ‘a’ is charged uniformly and the charge per unit length is λ .The electric field at its centre is

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a

λ2πεoa2

b

λ4εoa

c

λ22πεoa

d

λ2π εoa

answer is D.

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Detailed Solution

dE=Kλdxa2 dEnet=Kλdxa2cosθ E=∫-π2π2Kλdθacosθ=λ2π∈0a
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