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ELECTRIC FLUX MCQs

Total Questions : 20 | Page 1 of 2 pages
Question 1. An electric charge is placed at the center of a cube of side 'a'
  1.    q6∈0\frac{q}{6\in_0}6∈0​q​
  2.    q∈0\frac{q}{\in_0}∈0​q​
  3.    q∈0a2\frac{q}{\in_0a^2}∈0​a2q​
  4.    zero
 Discuss Question
Answer: Option A. -> q6∈0\frac{q}{6\in_0}6∈0​q​
Question 2. If the electric flux entering and leaving an enclosed surface respectively is ϕ1\phi_1ϕ1​ and ϕ2\phi_2ϕ2​ the electric charge inside the surface will be
  1.     (ϕ1+ϕ2)∈0\left(\phi_1+\phi_2\right)\in_0(ϕ1​+ϕ2​)∈0​  
  2.     (ϕ1−ϕ2)∈0\left(\phi_1-\phi_2\right)\in_0(ϕ1​−ϕ2​)∈0​  
  3.     (ϕ1+ϕ2)∈0\frac{\left(\phi_1+\phi_2\right)}{\in_0}∈0​(ϕ1​+ϕ2​)​  
  4.     (ϕ1−ϕ2)∈0\frac{\left(\phi_1-\phi_2\right)}{\in_0}∈0​(ϕ1​−ϕ2​)​  
 Discuss Question
Answer: Option B. ->  (ϕ1−ϕ2)∈0\left(\phi_1-\phi_2\right)\in_0(ϕ1​−ϕ2​)∈0​  
Question 3. When is the Electric Flux zero? (Check all that apply)
  1.    If inside the box there are equal magnitude charges with an opposite sign.
  2.    If the charges are outside the box.
  3.    If there are no charges inside the box.
  4.    All of above
 Discuss Question
Answer: Option D. -> All of above
Question 4. Suppose a point charge is located at the center of a spherical surface
  1.    The flux and field both decrease.
  2.    The flux increases, and the field decreases.
  3.    The flux decreases, and the field increases.
  4.    The flux remains the same, and the field increases.
 Discuss Question
Answer: Option D. -> The flux remains the same, and the field increases.
Question 5. If I triple the value of charge of a test charge the electric field will
  1.    Increase by 3 
  2.    Increase by 9
  3.    Not change
  4.    Decrease by 9
 Discuss Question
Answer: Option C. -> Not change
Question 6. Fringing of field lines is due to
  1.    Uniform electric field
  2.    Non uniform electric field
  3.    Uniform charges on plates
  4.    Non uniform charges on plates
 Discuss Question
Answer: Option B. -> Non uniform electric field
Question 7. Electric flux is maximum at angle
  1.    45
  2.    90
  3.    180
  4.    0
 Discuss Question
Answer: Option D. -> 0
Question 8. The intersection of field lines is due to
  1.    attraction
  2.    repulsion
  3.    it is not possible
  4.    both attraction and repulsion
 Discuss Question
Answer: Option C. -> it is not possible
Question 9. How do electric field lines represent the magnitude of an electric field?
  1.    Length of the line
  2.    With arrows
  3.    Density of lines
  4.    Width of lines
 Discuss Question
Answer: Option C. -> Density of lines
Question 10. Linear charge density λ=qL\lambda=\frac{q}{L}λ=Lq​ is used for example in:
  1.    plates or surfaces
  2.    wires
  3.    spheres
  4.    All of above
 Discuss Question
Answer: Option B. -> wires

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