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Review for Statics and Magnetism Test A- Multiple Choice 1. The following diagram shows two bar magnets and two compasses placed in a certain way. Compass S N Compass Magnet 1 S Magnet 2 N The poles are not indicated on magnets 1 and 2 in the diagram, but the compass needles show the direction of the magnetic fields of these magnets. Which of the following diagrams correctly indicates the poles of these magnets? A) B) C) D) S Magnet 1 N N Magnet 2 S S Magnet 1 N S Magnet 2 N N Magnet 1 S N Magnet 2 S N Magnet 1 S S Magnet 2 N 2. The following diagram shows a bar magnet and four compasses. Which compass shows the needle pointing in the correct direction? A) Compass 1 B) Compass 2 C) Compass 3 D) Compass 4 3. In the laboratory, you are given an ebonite rod, a piece of cotton and the following electrostatic list. Capacity to Ebonite gain electrons Polyethylene Cotton Glass The following diagram shows the ebonite rod and the piece of cotton before they are rubbed together. Ebonite rod + + Cotton Which of the following diagrams correctly shows the transfer of electric charges after the ebonite rod and the piece of cotton were rubbed together? Ebonite A) Ebonite C) Cotton Cotton B) D) Ebonite Ebonite Cotton Cotton 4. We are given four spheres, A, B C and D. Sphere A is positively charged and the charges on spheres B, C and D are unknown. The following diagram shows what happens to these spheres if we suspend them two by two close to each other. A B B C C D Given the diagram above, what are the charges on spheres C and D? A) Sphere C is positively charged and sphere D is negatively charged. B) Sphere C is positively charged and sphere D is positively charged. C) Sphere C is negatively charged and sphere D is negatively charged. D) Sphere C is negatively charged and sphere D is positively charged. 5. A) B) C) D) Which of the statements below is TRUE? Positively charged objects have fewer protons than electrons. Positively charged objects have more electrons than protons. Negatively charged objects have more electrons than protons. Negatively charged objects have more protons than electrons. 6. Static electricity can make hair stand up straight in the air as shown in the picture below. Which statement explains the behavior of hair in this situation? A) The strands of hair have opposite charges and therefore repel one another. B) The strands of hair and the air have opposite charges, so the hair is attracted by the air. C) The strands of hair have like charges and therefore repel one another. D) The strands of hair and the air have like charges, so the hair is attracted by the air. 7. Which of the following diagrams correctly shows the direction of the magnetic field lines? A) B) C) D) 8. Study the six diagrams below. Which diagram are correctly shown? A) 1, 2 and 4 B) 1, 3 and 5 C) 1, 2, 3 and 4 D) 1, 2, 4 and 6 9. The following diagram shows a compass placed over a conducting wire. Electricity is flowing through this wire. Compass + Which of the following compasses shows the needle pointing in the correct direction for this situation? A) C) S N N S B) S N D) N S B. Short Answer 10. During a static electricity lab, a student rubs 5 pieces of different materials together two at a time. Table 1 below shows which of two materials were rubbed and which became negatively charged once they were rubbed. Table 1- Negatively charged materials Materials being rubbed Substance which gained electrons Wood and nickel Nickel Wood and silk Wood Wood and lead Wood Lead and nickel Nickel Lead and silk Silk Nickel and silk Nickel Nickel and glass Nickel Wood and glass Wood Glass and lead Lead Glass and silk Silk Using the information in Table 1, you must put the 5 materials in order starting with the substance which will most easily gains electrons (becomes negatively charged) to the substance which will most easily lose electrons (becomes positively charged). Object 1. 2. 3. 4. 5. Tendency to attract electrons 11. A student conducted an experiment involving three electrically charged spheres A, B and C. The steps in the experiment and some of the results are given below. STEP RESULT 1. Bring sphere A close to sphere B. 1. They repelled each other. 2. Bring sphere A close to sphere C. 2. They attracted each other. 3. Bring sphere B close to sphere C. 3. ? Given the above information, what was the result of Step 3? 12. Choose the diagrams which are correctly represented, S S N N N + + N S S 13. For the spheres below, determine which is positively charges, which is negatively charged and which is neutral. 14. A student rubbed two identical inflated balloons on a piece of fur and suspended them from a high stand. He then rubbed a plastic ruler with a piece of wool and placed it between the two suspended balloons. The balloons quickly went high in the air as shown in the diagram below. Knowing that the wool cloth transferred electrical charges to the ruler, determine the overall charge of the balloons, fur, ruler and wool cloth. 15. In the laboratory, you are asked to observe the electrical behaviour of certain materials using the following electrostatic list. You start by rubbing a glass rod with a piece of silk and then suspend the electrically charged glass rod from an insulated wire. You then rub a vinyl ruler with a piece of wool. Last, you bring the electrically charged vinyl ruler close to the suspended glass rod. A) State the charge on the glass rod. B) State the charge on the vinyl ruler. C) Will the glass rod and the vinyl ruler attract or repel? 16. On the pictures below, put in the correct compass direction for each diagram. 17. Put in the correct compass directions in the diagram below. 18. Add in the appropriate signs in the picture below.