Electric Flux(General Knowledge > General Science ) Questions and answers for exam Preparation

Question 1. An electric charge is placed at the center of a cube of side 'a'

q6∈0\frac{q}{6\in_0}6∈0q
q∈0\frac{q}{\in_0}∈0q
q∈0a2\frac{q}{\in_0a^2}∈0a2q
zero

Explanation:-

Answer: Option A. -> q6∈0\frac{q}{6\in_0}6∈0q

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

(ϕ1+ϕ2)∈0\left(\phi_1+\phi_2\right)\in_0(ϕ1+ϕ2)∈0
(ϕ1−ϕ2)∈0\left(\phi_1-\phi_2\right)\in_0(ϕ1−ϕ2)∈0
(ϕ1+ϕ2)∈0\frac{\left(\phi_1+\phi_2\right)}{\in_0}∈0(ϕ1+ϕ2)
(ϕ1−ϕ2)∈0\frac{\left(\phi_1-\phi_2\right)}{\in_0}∈0(ϕ1−ϕ2)

Explanation:-

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)

If inside the box there are equal magnitude charges with an opposite sign.
If the charges are outside the box.
If there are no charges inside the box.
All of above

Explanation:-

Answer: Option D. -> All of above

Question 4. Suppose a point charge is located at the center of a spherical surface

The flux and field both decrease.
The flux increases, and the field decreases.
The flux decreases, and the field increases.
The flux remains the same, and the field increases.

Explanation:-

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

Increase by 3
Increase by 9
Not change
Decrease by 9

Explanation:-

Answer: Option C. -> Not change

Question 6. Fringing of field lines is due to

Uniform electric field
Non uniform electric field
Uniform charges on plates
Non uniform charges on plates

Explanation:-

Answer: Option B. -> Non uniform electric field

Question 7. Electric flux is maximum at angle

45
90
180
0

Explanation:-

Answer: Option D. -> 0

Question 8. The intersection of field lines is due to

attraction
repulsion
it is not possible
both attraction and repulsion

Explanation:-

Answer: Option C. -> it is not possible

Question 9. How do electric field lines represent the magnitude of an electric field?

Length of the line
With arrows
Density of lines
Width of lines

Explanation:-

Answer: Option C. -> Density of lines

Question 10. Linear charge density λ=qL\lambda=\frac{q}{L}λ=Lq is used for example in:

plates or surfaces
wires
spheres
All of above

Explanation:-

Answer: Option B. -> wires