Electric Charges and Fields Test

Result

Electric Charges and Fields Test - 88

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Weekly Quiz Competition

Question 1
1 / -0

A charge q is placed at one corner of a cube. The electrons flux through any of the three faces adjacent to the charge is zero. The flux through any one of the other three is

A
$$q/3{ \epsilon }_{ 0 }$$

B
$$q/6{ \epsilon}_{ 0 }$$

C
$$q/12{ \epsilon }_{ 0 }$$

D
$$q/24{ \epsilon}_{ 0 }$$

Solution
Question 2
1 / -0

The surface density of charge on a very large flat metal plate is $$2.25 \times 10^{-9} coul/m^2$$. The intensity of electric field at a point at a distance 20 cm from the middle part of plate is

A
$$90 \pi N/C$$

B
$$100 \pi N/C$$

C
$$45 \pi N/C$$

D
$$81 \pi N/C$$

Solution
Question 3
1 / -0

A long cylindrical conductor, of radius $$5\mathrm { mm }$$ and placed in a medium of permittivity $$55.55\mathrm { pF } / \mathrm { m } ,$$ has surface charge density of $$2\mu \mathrm { C } / \mathrm { m } ^ { 2 } .$$ The magnitude of the electric intensity at a point $$2\mathrm { m }$$ from its axis is nearly

A
$$9 \mathrm { N } / \mathrm { C }$$

B
$$90 \mathrm { N } / \mathrm { C }$$

C
$$1.111 \times 10 ^ { 2 } \mathrm { N } / \mathrm { C }$$

D
$$1.111 \times 10 ^ { -2 } \mathrm { N } / \mathrm { C }$$

Solution
Question 4
1 / -0

A current $$I$$ flows through a cylindrical rod of uniform cross-section area $$A$$ and resistivity $$\rho$$. The electric flux through the shaded cross-section of rod as shown in figure is :

A
$$2 pI$$

B
$$pI$$

C
$$\dfrac { pI }{ A } $$

D
$$\dfrac { pA }{ I } $$

Solution
Question 5
1 / -0

The electric flux through the surface

A
in Fig. (iv) is the largest

B
in Fig. (iii) is the least

C
in Fig. (ii) is same as Fig. (iii) but is smaller then Fig (iv)

D
is the same for all the figures

Solution
Question 6
1 / -0

Two points charges $$+q_{1}$$ and $$+q_{2}$$ are placed at a certain distance apart, then

A
They produce the same electric field on each other

B
They exert same forces on each other

C
For minimum force between them, the magnitude of each charge must be equal to $$1.6\times 10^{-19}C$$

D
All of the above

Solution
Question 7
1 / -0

A charged particle $$q$$ is placed at the centre $$O$$ of a cube of length $$L(A\ B\ C\ D\ E\ F\ G\ H)$$. Another same charge $$q$$ is placed at a distance $$L$$ from $$O$$. Then the electric flux through $$ABCD$$.

A
$$q/6\pi \epsilon_{0}L$$

B
Zero

C
$$q/2\pi \epsilon_{0}L$$

D
$$q/3\pi \epsilon_{0}L$$

Solution
Question 8
1 / -0

The electric lines of force are represented by the equation $$x^2+y^2=1$$. A unit positive charge initially at rest at point $$(1,0)$$ will move.

A
along the circular line of force

B
at right angles to circular line of force

C
along equidistant parallel lines of force

D
at right angles to equidistant parallel lines of force

Solution
Question 9
1 / -0

Mark correct option:
Electrostatic experiment is

A
Affected on the humid day

B
Not affected on humid day

C
Independent of medium

D
None of the above

Solution
Question 10
1 / -0

In the following diagrams, all the charges have equal magnitude. Electric field is zero at the centre of

A

B

C

D
All of these

Solution