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Q.

Electric charge is uniformly distributed along a long straight wire of radius 1 mm. The charge per cm length of the wire is Q coulomb. Another cylindrical surface of radius 50 cm and length 1m symmetrically encloses the wire as shown in fig . The total electric flux passing through the cylindrical surface is 

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a

Qε0

b

10 Q(πε0)

c

100 Q(πε0)

d

100 Qε0

answer is B.

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Detailed Solution

λ=Qcm
ϕ=qmε0=Q×100cmε0

ϕ=100Qε0

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