Physics M4 Electrical Field

Electric FieldPHYSICS MODULE 4 UNIT 1 LESSON 4

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OBJECTIVES ELECTRIC FIELD QUIZINTRODUCTION

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Introduction

Click ANIMATE and observe the following animation. Answer the questions on slide 3. Type your response in the box provided. Click CHECK for answers.

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ANIMATEANIMATE

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Introduction

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1. What would happen if a positively charge balloon is brought near to a negatively charged balloon? Ans: It will attract negative

the balloon.

2. What would happen if a positively charge balloon is brought near to another positively charged balloon? Ans: It will attract negative

the balloon.

3. Are there forces between the balloons in i and ii? Ans: Yes.

4. If the distance of the balloons increases what would happen to the magnitude of the force? Ans: The force will decrease.

CHECKCHECK

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Objectives

As a result of this lesson, the student will be able to:1.define electric field and electric field lines in your own words.2.explain direction and variation in the strength of the electric field around a charged particle.

3.state Coulomb’s Law 4.draw electric field patterns for negative and positive point charges and between charged parallel plates

5.describe one hazard and one useful application of static charge.6.actively participate in class discussion between the teacher and their peers.

7.work independently and collaboratively with others.

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Electric Field

View the picture of the football field and then answer questions:

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1. Is the football field surrounded by a boundary line?

Ans: Yes

2. Can you calculate the area of the football field?

3. Is the football field a region?

Ans: Yes

Ans: Yes

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Electric Field cont.


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4. Whenever a football comes off the field in football match, what happens to the games?

Ans: The game is briefly paused until the ball is officially thrown back on the field.

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5. If there is a rotten egg in a room that you entered, would it matter where you are in relation to the egg?

Ans: No

6. If you get closer to the rotten egg, how can you tell?

CHECKCHECK

Ans: The horrible scent (stink) will get stronger as I get closer to the source.CHECKCHECK


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7. Can you smell the rotten egg in one direction only?

Ans: No, the scent will radiate in all directions.CHECKCHECK

8. Is there a region where you would not smell the scent?

Yes, outside a boundary.

9. If the number of rotten eggs in the room increases, how can you tell? Explain.

CHECKCHECK

Ans: Yes, as the number of rotten eggs increases, the scent will get worse.CHECKCHECK


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10. Would your nose change the properties of the rotten egg or eggs?

Ans: The nose will detect the sense but will not change the strength of the scent.CHECKCHECK

11. Do you think there is an area in which the scent is concentrated?

Answer: Yes

12. Do you think the area in which the scent is concentrated is a field?

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Answer: YesCHECKCHECK


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13. What is a ‘stink field’?

Ans: The area in which a stink scent is observed.CHECKCHECK


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FIG 2.1 : Showing the electric field lines of positively charged particle

FIG 2.2 : Showing the electric field lines of negatively charged particle

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1. In which direction are the arrows on the positive charge pointing?

Ans: They move away from the positive charge.

2. In which direction are the arrows on the negative charge pointing?

Ans: They move towards the negative charge.

3. If a test positive charge is brought close to a positive charge in which direction would the test charge move?

Ans: It will move away from a positive charge.

Questions

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4. If a test positive charge is brought close to a negative charge in which direction would the test charge move?

Ans: It will move towards the negative charge.

5. What is an electric field?

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Electric Field Line

Click the ANIMATE button and then note your observation of electric field lines.

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Electric Field Line

a. A point negative charged particle

b. A parallel charged plate

c. Two opposite charged particles

d. Two negative charged particles

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Drawing electric field lines for :Drawing electric field lines for :


XXQUIZ

Are you ready to test yourself?

1.There are seven multiple choice items that you are required to do.

2.For each item, click on the letter of the correct response and then click the button ‘NEXT QUESTION’ to continue.

3.Click the green button to begin.

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BEGIN QUIZ!


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Quiz: Question 1

What is polarity of the particles labelled X and Y in the diagram?

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A. X is positive and Y is negative

B. Y is negative and Y is positive

C. They are both negative

D. They are both positive.

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Quiz: Feedback to Question 1

What is polarity of the particles labelled X and Y in the diagram?

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Both particles are positive since particle Y is attracted to the negative charge and the direction of the electric field is moving from the particles.


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Quiz: Question 2

What does the direction of the electric field lines show ?

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A. strength of the field

D. direction of the force on a negative test charge

C. size of the field

B. direction of the force on a positive test charge

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What does the direction of the electric field lines show?


Since the direction of electric field of a positively charged particle moves outward and inward for negatively charged particle, then the electric field line shows the direction of the force on a positive test charge.


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Quiz: Question 3

Which point on the electric field of the particles in the figure on the right would the weakest electric force be located?

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A. 4

D. 2

B. 3

C. 1

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Which point on the electric field of the particles in the figure on the right would the weakest electric force be located?


Electric force decreases as the distance from the charged particle increases.


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Quiz: Question 4

The figure to the right shows a proton (a positively charged particle) in the electric field of a parallel plate capacitor. What direction will the proton move in the field?

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A. East

D. South

C. North

B. West

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The figure to the right shows a proton (a positively charged particle) in the electric field of a parallel plate capacitor. What direction will the proton move in the field?


Since the proton is positively charged, it moves away from the positively charged plate (repulsion ) and moves to the negatively charged plate (attraction). Hence the proton will move to the negatively charged plate (west).


XXEnd of Quiz

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Physics M4 Electrical Field

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Transcript of Physics M4 Electrical Field