Download Review for Statics and Magnetism Test

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.