Electric Flux NEET Questions

Physics - Electrostatics

Electric Flux MCQ Questions


13.
A surface enclosing an electric dipole shows zero flux. This is because:
A.
The surface is conductor
B.
Dipoles do not produce electric fields
C.
Electric field lines cannot cross a surface
D.
Net charge inside is zero
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ANSWER :
D. Net charge inside is zero
14.
If the electric field at a point on a Gaussian surface is zero, then:
A.
The charge enclosed must be zero
B.
The flux through the surface need not be zero
C.
The total charge inside the surface is positive
D.
The flux through the surface is necessarily zero
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ANSWER :
B. The flux through the surface need not be zero
15.
If the net flux through a Gaussian surface is zero, which of the following statements is true?
A.
The net charge inside the surface is zero
B.
There must be no charges inside the surface
C.
Charges must be present outside the surface only
D.
The electric field is zero at every point on the surface
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ANSWER :
A. The net charge inside the surface is zero
16.
A square surface of side L is in a uniform electric field E. If the surface is in the plane perpendicular to E, the flux through it is:
A.
E/L²
B.
Zero
C.
EL²
D.
EL
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ANSWER :
C. EL²
17.
The electric field in a region is E = (3î + 4ĵ) × 10³ N/C. The flux through a 1 m² surface lying in the y-z plane is:
A.
5000 N m² C⁻¹
B.
4000 N m² C⁻¹
C.
7000 N m² C⁻¹
D.
3000 N m² C⁻¹
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ANSWER :
D. 3000 N m² C⁻¹
18.
An electric field E = 200 î N/C exists in space. The flux through a circular area of radius 0.1 m placed parallel to the y-z plane is:
A.
20π N m² C⁻¹
B.
6.28 N m² C⁻¹
C.
2π N m² C⁻¹
D.
62.8 N m² C⁻¹
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ANSWER :
B. 6.28 N m² C⁻¹