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 1 m symmetrically encloses the wire as shown in the figure. The total electric flux passing through the cylindrical surface is

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a

100Qπε0

b

100Qε0

c

Qε0

d

10Qπε0

answer is B.

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Detailed Solution

For 1cm length, charge=Q
For 1m=100cm length, charge =100Q
Total electrical flux passing
Through the surface =Qnet ε0=100Qε0

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