Total electric flux coming out of a unit positive charge put in air is 

(1) ε0

(2) ε01

(3) (4pε0)1

(4) 4πε0 

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A cube of side l is placed in a uniform field E, where E=Ei^. The net electric flux through the cube is

(1) Zero

(2) l2E

(3) 4l2E

(4) 6l2E

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Eight dipoles of charges of magnitude e are placed inside a cube. The total electric flux coming out of the cube will be 

(1) 8eε0

(2) 16eε0

(3) eε0

(4) Zero 

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Electric dipole
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A charge q is placed at the centre of the open end of the cylindrical vessel. The flux of the electric field through the surface of the vessel is 

(1) Zero

(2) qε0

(3) q2ε0

(4) 2qε0 

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According to Gauss’ Theorem, electric field of an infinitely long straight wire is proportional to 

(1) r

(2) 1r2

(3) 1r3

(4) 1r

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Electric charge is uniformly distributed along a long straight wire of radius 1mm. 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 the figure. The total electric flux passing through the cylindrical surface is 

(1) Qε0

(2) 100Qε0

(3) 10Q(πε0)

(4) 100Q(πε0)

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The S.I. unit of electric flux is 

(1) Weber

(2) Newton per coulomb

(3) Volt × metre

(4) Joule per coulomb

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q1, q2, q3 and q4 are point charges located at points as shown in the figure and S is a spherical Gaussian surface of radius R. Which of the following is true according to the Gauss’s law ?

1. s(E1+E2+E3).dA=q1+q2+q32ε0

2. s(E1+E2+E3).dA=(q1+q2+q3)ε0

3. s(E1+E2+E3).dA=(q1+q2+q3+q4)ε0

4. None of the above

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If the electric flux entering and leaving an enclosed surface respectively is φ1 and φ2 the electric charge inside the surface will be 

(1) (φ1+φ2)ε0

(2) (φ2φ1)ε0

(3) (φ1+φ2)/ε0

(4) (φ2φ1)/ε0 

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Shown below is a distribution of charges. The flux of electric field due to these charges through the surface S is 

(1) 3q/ε0

(2) 2q/ε0

(3) q/ε0 

(4) Zero

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