Electric Charges and Fields Test

Result

Electric Charges and Fields Test - 78

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Weekly Quiz Competition

Question 1
1 / -0

Below figure shows a closed surface which intersects a conducting sphere. if a positive charge is placed at $$P,$$ the flux of the electric field through the closed surface

A
Will remain zero

B
will be positive

C
will be negative

D
will be undefined

Solution
Question 2
1 / -0

In an electroscope, if aluminium strips are replaced by plastic strips, and a charged object is touched with the metal top of the electroscope:

A
the plastic strips will diverge

B
the plastic strips will not diverge

C
one strip will move away while other will remain
same.

D
the plastic strips will come more closer.

Solution
Question 3
1 / -0

A point charge $$ + 20\mu C$$ is at a distance 4 cm above the center of a square of side 8 cm. What is the magnitude of electrostatic flux through the square?

A
$$3.76 \times {15^5}{\text{N}}{{\text{m}}^2}{{\text{C}}^{ - 1}}$$

B
$$4.2 \times {15^5}{\text{N}}{{\text{m}}^2}{{\text{C}}^{ - 1}}$$

C
$$2.9 \times {15^5}{\text{N}}{{\text{m}}^2}{{\text{C}}^{ - 1}}$$

D
$$5.1 \times {15^5}{\text{N}}{{\text{m}}^2}{{\text{C}}^{ - 1}}$$

Solution
Question 4
1 / -0

Two point charges $$+q$$ and $$-q$$ are held fixed at $$(-d,0)$$ and (d,0) respectively of a coordinate system$$,$$ then

A
$$(!)$$ The electric field $$\overrightarrow E $$ at all points on the $$X-axis$$ has the same direction

B
$$\overrightarrow E $$ at all points on the $$y-axis$$ is along $$\overrightarrow i $$

C
work has to be done in bringing a test charge from infinity to the origin slowly$$.$$

D
The dipole moment is $$2qd$$ directed along $$\overrightarrow i $$

Solution
Question 5
1 / -0

Two etalic spheres of radii $$1 CM$$ and $$3 CM$$ are given charges of $$ - 1 \times {10^{ - 2}}C$$ and $$5 \times {10^{ - 2}}C,$$ respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is :-

A
$$4 \times {10^{ - 2}}C$$

B
$$1 \times {10^{ - 2}}C$$

C
$$2 \times {10^{ - 2}}C$$

D
$$3 \times {10^{ - 2}}C$$

Solution
Question 6
1 / -0

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

A
$$1 :5$$

B
$$1:1$$

C
$$5:1$$

D
$$1:25$$
Question 7
1 / -0

A flat square surface with sides of length L is described by the equations $$x = L,0 \le y \le L,0 \le z \le L$$. the electric flux through the square due to a positive point charge $$q$$ located at the origin $$\left( {x = 0,y = 0,z = 0} \right)$$

A
$$\dfrac{q}{{4{\varepsilon _0}}}$$

B
$$\dfrac{q}{{6{\varepsilon _0}}}$$

C
$$\dfrac{q}{{24{\varepsilon _0}}}$$

D
$$\dfrac{q}{{48{\varepsilon _0}}}$$

Solution
Question 8
1 / -0

Among two disc A and B first have radius 10 centimetre and charge $$10^{-6} C$$ and second have radius 30 centimetre and charge $$10^{-5} C$$. When they are touched, chanrge on both $$q_A$$ and $$q_B$$ respectively will be

A
$$q_A= 2.75 \mu C$$ and $$q_B= 8.25 \mu C$$

B
$$q_A= 1.09 \mu C$$ and $$q_B= 1.53 \mu C$$

C
$$q_A= q_B= 5.5 \mu C$$

D
None of these

Solution
Question 9
1 / -0

Two point charges $$2C$$ and $$-6C$$ attract each other with a force of $$12N$$.A negative of $$2C$$ is added to each of the above charges, now the force between them is:

A
32 N

B
8 N

C
zero

D
4 N

Solution
Question 10
1 / -0

Two equipotential spherical surface having potential $$20\ V$$ and $$0\ V$$ are as shown in figure. There is no charge anywhere in space except on the surface of both the spheres. Then which of the following figure represents the nature of electric field in region between the spherical surface by electric lines of forces.

A

B

C

D

Solution