Free Printable STPM Chapter 12

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STPM Chapter 12

Total questions: 19

Worksheet time: 38mins

Name

Class

Date

Three charged particles which are arranged in a straight line is shown in the diagram.

What is the electrostatic force acting on Q₃,due to the other two charges?

12.5 N in the negative-x direction

12.5 N in the positive-x direction

27.5 N in the negative-x direction

27.5 N in the positive-x direction

Two point charges +35μC and Q are placed 300cm apart.If they attract each other with a force of 0.525 N,what is the charge Q?

+167 μC

+15 μC

-15 μC

-167 μC

Two point charges attract each other with force F.If one of the charges is tripled and the separation between the charges is reduced to one quarter of its original distance,the new force is

$\frac{3}{4}F$

$\frac{9}{16}F$

$12F$

$48F$

Two point charges,-Q and -2Q,repel each other with a force of magnitude,F₀.Extra charges of -Q are then added to each of the point charge and the distance of separation between the charges is doubled.The new force,in terms of F₀,that exists between the charges is

\frac{1}{4}F_0

$\frac{1}{2}F_0$

$\frac{3}{4}F_0$

$\frac{3}{2}F_0$

The electric field strength is the

work done to bring a proton at a point

electrostatic force that acts on a proton placed at a point

electrostatic force that acts on a unit of positive charge at a point

work done to bring a unit of positive charge from infinity to a point

A dust particle of mass 2.0 x 10^-18kg carries a charge of -1.60 x 10^-19C.It is placed in a uniform downward electric field strength of 200 N C^-1and a uniform gravitational field strength of 9.81N kg^-1.What is the magnitude and direction of the resultant force of the dust particle?

1.24 x 10^-17 N,upwards

1.24 x 10^-17 N,downwards

5.16 x 10^-17 N,upwards

5.16 x 10^-17 N,downwards

The electric field due to a point charge Q is shown in the diagram.The electric field lines are radial lines which are directed toward the point charge.

Which statement is true about the pattern of electric field?

The lines are equipotential lines

The point charge is positively charged

The magnitude of the electric field increases with the increases in distance from the point charge

The direction of the lines shows the direction of force experienced by a test positive charge

Which diagram shows the resultant electric field when a conducting plate is placed in between two parallel metal plates which are connected to a constant voltage supply?

A spherical surface of radius R containing charges +2Q, -3Q and +5Q is shown in the diagram.What is the total electric flux which passes through the spherical surface?

$\frac{Q}{\pi\epsilon R^2}$

$\frac{Q}{\pi\epsilon R}$

$\frac{Q}{\epsilon}$

$\frac{4Q}{\epsilon}$

10.

Which diagram shows the correct electric field lines when a spherical conductor is placed in a uniform electric field?

11.

The electric field around an electric dipole is shown in the diagram.S1,S2,S3 and S4 are four Gaussian surface. Which surface has no net electric flux?

12.

The variation of the electric potential V with distance r from the centre of a charge conducting sphere of radius R is shown by the graph.

Which graph shows the relationship between the electric field strength E with the distance r?

13.

A charge Q of +125 $\mu C$ is fixed at the centre of a square of length 0.64m is shown in the diagram.
If a charge p of +7.0 $\mu C$ is moved from X to Y,what is the work done to the charge Q?

0 J

12.3 J

17.5 J

24.6 J

14.

Three positive point charges each of magnitude Q are placed one after another at each corner of an equilateral triangle of slide $a$ . What is the total potential energy of the system of charges ?

$\frac{3Q}{4\pi\epsilon_oa}$

$\frac{3Q^2}{4\pi\epsilon_oa}$

$\frac{3Q}{4\pi\epsilon_oa^2}$

$\frac{3Q^2}{4\pi\epsilon_oa^2}$

15.

The work done to bring a positive charge of 1.6 x 10^-19 C from infinity to a point P in an electric field is 8.0 x 10^-16J. What is the electric potential at P?

-5.0 x 10³V

-2.5 x 10³ V

2.5 x 10³ V

5.0 x 10³ V

16.

Spherical conductor Y is larger than spherical conductor X . Conductor X is initially uncharged whereas conductor Y is charged. A wire is connected from conductor Y to X . Which statement is true when equilibrium is attained ?

conductor X and Y have the same electric potentials.

conductor X and Y have the same quantity of charges

conductor X and Y have the same surface charge density

conductor X and Y have the same electric field strength at the surface

17.

A proton enters a uniform electric field at X and moves in a parabolic path to Y as shown in the diagram. If the field strength is 500 Vm^-1 . What is the change in kinetic energy of the proton ?

-3.2 x 10^-17 J

-2.4 x 10^-17 J

+2.4 x 10^-17 J

+3.2 x 10^-17 J

18.

Two point charges +Q and another two point charges -Q which are located at the four vertices of a square of dimension $a$ is shown in the diagram.
What is the electric field strength and electric potential at P?

Electric field strength=0, Electric potential=0

Electric field strength=0, Electric potential= $\frac{\sqrt{2Q}}{\pi\epsilon_oa}$

Electric field strength= $\frac{\sqrt{2Q}}{\pi\epsilon_oa^2}$ , Electric potential=0

Electric field strength= $\frac{\sqrt{2Q}}{\pi\epsilon_oa^2}$ , Electric potential= $\frac{\sqrt{2Q}}{\pi\epsilon_oa}$

19.

Three points,X,Y and Z,in a uniform electric field,E,of magnitude 200Vm^-1 are shown in the diagram.

What is the work done to move an electron from X to Z?

1.3 x 10^-17 J

1.6 x 10^-17 J

2.2 x 10^-17J

3.2 x 10^-17 J

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STPM Chapter 12

Total questions: 19

Worksheet time: 38mins

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