Electric Charges and Fields Test

Result

Electric Charges and Fields Test - 86

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

The force between two charges 0.06$$\mathrm { m }$$ apart is 5$$\mathrm { N }$$ . If the charges are moved towards each other by 0.05$$\mathrm { m }$$ , then the force between them is

A
7.2$$\mathrm { N }$$

B
8.5$$N$$

C
3.5$$\mathrm { N }$$

D
4.5$$\mathrm { N }$$

Solution
Question 2
1 / -0

A hemispherical surface of radius R is kept in a uniform electric field E as shown in figure .The flux through the curved surface is

A
$$E2\pi R^{ 2 }$$

B
$$E\pi R^{ 2 }$$

C
$$E4\pi R^{ 2 }$$

D
Zero

Solution
Question 3
1 / -0

A point charge is placed at origin. Electric field due to that charge at point (a, b, c) is $$E_1 \hat{i}+ E_2 \hat{j}+ E_3 \hat{k}.$$ Then electric field at (a, 0, 0) due to that charge will be

A
$$E_1 \hat{i}$$

B
$$\frac{E_1^2}{\sqrt{E_1^2+ E_2^2+ E_3^2}} \hat{i}$$

C
$$\frac{E_1(a^2+b^2+c^2)^{3/2}}{a^3} \hat{i}$$

D
$$\sqrt{E_1^2+ E_2^2 + E_3^2} \hat{i}$$

Solution
Question 4
1 / -0

Six charges +Q each are placed at the corners of a regular hexagon of side (a). The electric field at the center of hexagon is-

A
Zero

B
$$\dfrac { 1 }{ 4\pi { \epsilon }_{ 0 } } .\frac { 6{ Q }^{ 2 } }{ { a }^{ 2 } } $$

C
$$\dfrac { 1 }{ 4\pi { \epsilon }_{ 0 } } .\frac { { Q }^{ 2 } }{ { a }^{ 2 } } $$

D
$$\dfrac { 1 }{ 4\pi { \epsilon }_{ 0 } } .\frac { 6{ Q }^{ 2 } }{ a\sqrt { 2 } } $$

Solution
Question 5
1 / -0

A point charge $$q$$ is placed at a point inside a hollow conducting sphere. Which of the following electric force pattern is correct?

A

B

C

D

Solution
Question 6
1 / -0

A charge $$Q\mu C$$ is placed at the center of a cube, the flux coming out from three face will be (in coulomb) :

A
$$\dfrac { Q }{ 6{ \varepsilon }_{ 0 } } \times { 10 }^{ -6 }$$

B
$$\dfrac { Q }{ 2{ \varepsilon }_{ 0 } } \times { 10 }^{ -6 }$$

C
$$\dfrac { 3Q }{ { \varepsilon }_{ 0 } } \times { 10 }^{ -6 }$$

D
$$\dfrac { Q }{ 24{ \varepsilon }_{ 0 } } \times { 10 }^{ -6 }$$

Solution
Question 7
1 / -0

A small element $$ l $$ is cut from a circular ring of radius $$a$$ and $$\lambda $$ charge per unit length. The net electric field at the center of the remaining ring is

A
zero

B
$$\dfrac { \lambda l }{ 4{ \pi \epsilon }_{ 0 }{ a }^{ 2 } } $$

C
infinity

D
$$\dfrac { \lambda }{ 4{ \pi \epsilon }_{ 0 }l } $$

Solution
Question 8
1 / -0

The force between two charges $$0.06m$$ apart is $$5N$$. If each charge is moved towards the other by $$0.01m$$, then the force between will become

A
$$7.20N$$

B
$$11.25N$$

C
$$22.50N$$

D
$$45.00N$$

Solution
Question 9
1 / -0

If $$+ q $$charge is placed inside any spherical surface then total flux coming out from whole surface will be -

A
$$q\times\epsilon_0$$

B
$$\dfrac{q}{\epsilon_0}$$

C
$$\dfrac{\epsilon_0}{q}$$

D
$$\dfrac{q^2}{\epsilon_0}$$

Solution
Question 10
1 / -0

Two point charges 1 and 5 $$\mu C$$ are separated by a certain distance. What will be ratio of forces acting on these two?

A
$$1 : 5$$

B
$$5 : 1$$

C
$$1 : 1$$

D
$$0$$

Solution