Electric Charges and Fields Test

Result

Electric Charges and Fields Test - 80

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Weekly Quiz Competition

Question 1
1 / -0

A uniform electric field exists in the region as shown. The total electric flux through the cube of side $$l$$, is

A
$$l^{ 2 }E$$

B
$$\sqrt { 2l } ^{ 2 }E$$

C
Zero

D
$$6{ l }^{ 2 }E$$

Solution
Question 2
1 / -0

Charge $$q$$ is kept at centre of cylindrical body, flux of circle square of body is $$\phi_{0}$$ then flux of curve surface of body is

A
$$\dfrac { q }{ { \varepsilon }_{ 0 } } $$

B
$$\dfrac { q }{ { \varepsilon }_{ 0 } } +\pi$$

C
$$\dfrac { q }{ { 2\varepsilon }_{ 0 } }+\phi $$

D
$$\dfrac { q }{ { \varepsilon }_{ 0 } }-\phi $$

Solution
Question 3
1 / -0

A charge $$q$$ is placed inside a cube of side $$a$$ as shown in the figure. $$O$$ is the centre of the face $$ABCD$$ and $$q$$ is just above the point $$O$$ at a distance $$\cfrac{a}{4}$$. The electric flux passing through $$ABCD$$ is

A
$$\cfrac{q}{6{\epsilon}_{0}}$$

B
$$< \cfrac{q}{6{\epsilon}_{0}}$$

C
$$> \cfrac{q}{6{\epsilon}_{0}}$$

D
$$\cfrac{q}{{\epsilon}_{0}}$$

Solution
Question 4
1 / -0

If $$E_{a}$$ be the electric field strength of a short dipole at a point on its axial line and $$E_{e}$$ that on the equatorial line at the same distance, then

A
$$E_{e} = 2E_{a}$$

B
$$E_{a} = 2E_{e}$$

C
$$E_{a} = E_{e}$$

D
None of the above

Solution
Question 5
1 / -0

There are two charges $$ +1$$ $$\mu$$ and $$+5$$ $$\mu$$ .The ratio of the forces acting on them will be

A
$$1:5 $$

B
$$1:1$$

C
$$5:1$$

D
$$1:25$$

Solution
Question 6
1 / -0

Equal charges of each $$2\mu C$$ are passes $$x=0, 2, 4$$ and 8 $$cm$$ on the x-axis. The force experienced by the charge at $$x=2 cm$$ is equal to

A
$$5 N$$

B
$$10 N$$

C
$$6 N$$

D
$$15 N$$

Solution
Question 7
1 / -0

At some point in space the electric field is $$5\ NC^{-1}$$. The electric lines of force crossing a unit area placed at right angles to electric field at this point is:-

A
$$\varepsilon_0$$

B
$$\dfrac{\varepsilon_0}{4\pi}$$

C
$$4 \pi \varepsilon_0$$

D
$$5$$

Solution
Question 8
1 / -0

If two identical spheres having charge 16 $$\mu C$$ and -8 $$\mu C$$ are kept at certain distance apart, then the force is F. They are touched and again kept at the same distance, the force

A
F

B
$$\frac{F}{18}$$

C
$$\frac{F}{8}$$

D
$$\frac{F}{2}$$

Solution
Question 9
1 / -0

In an atom, two electrons move around the nucleus in circular orbits of radii $$R$$ and $$4R$$. The ratio of the time taken by them to complete one revolution is : ( neglect electric interaction )

A
$$1:4$$

B
$$4:1$$

C
$$1:8$$

D
$$8:1$$

Solution
Question 10
1 / -0

What is the distance between two electrons if one exerts a force upon other equal to its weight

A
$$0.5\ m$$

B
$$5.06\ m$$

C
$$4.06\ m$$

D
$$6.04\ m$$

Solution