## Tuesday, 20 September 2022

### ELECTRIC FLUX : MCQ ON ELECTRIC FLUX

AREA VECTOR

AREA VECTOR is a vector whose magnitude is the surface area of the desired surface and points in the direction normal to that surface.

ELECTRIC FLUX

It is the measure of electric field flowing through a surface. The electric flux value through a surface is proportional to the electric field lines flowing through it.

Φ_{E} =E.ds

Q1 Units of Electric flux are

• NC^{-1}m^{2}
• NC^{-2}m^{-1}
• N^{-1}C^{-1}m^{2}
• NC^{2}m^{2}

• NC^{-1}m^{2}

Q2 Electric Flux through a closed surface according to Gauss’ law is

• \frac{ε_{0}}{q}
• \frac{q}{ε_{0}}
• q{ε_{0}}
• None of these

• \frac{q}{ε_{0}}
•

Q3 Electric Flux is minimum when the angle between the electric field lines and the area vector of the surface is

• 0^{0}
• 90^{0}
• 60^{0}
• 45^{0}

• 90^{0}

Q4 The electric field due to infinite plane sheet of charge density σ is:

• 0
• σ
• \frac{σ}{ε_{0}}
• \frac{σ}{2ε_{0}}

• \frac{σ}{ε_{0}}

Q5 The electric flux due to a line charge falls off with distance as

• \frac{1}{r}
• \frac{1}{r^{2}}
• r
• None of these

• \frac{1}{r}

Q6 Units of Electric flux are

• NC^{-1}m^{2}
• NC^{-2}m^{-1}
• N^{-1}C^{-1}m^{2}
• NC^{2}m^{2}

• NC^{-1}m^{2}

Q7  Electric field inside charged spherical shell is zero

• True
• False

• True
•

Q8 Area Vector is a

• Scalar quantity
• Vector quantity

• Vector quantity

Q9 Electric flux is a scalar quantity

• True
• False

• True

Q10 The area vector of a surface lying in the x-y plane on the coordinate axes, points along the z direction

• True
• False

• True
•