SNC1D Electrostatics QUIZ (Spring 2013)

Name:______

SNC1D Electrostatics QUIZ (spring 2013)

Multiple Choice (5 points)
____1. Rabbit fur is above rubber in the electrostatic series. What would happen if rabbit fur were rubber with a rubber balloon?
a) the rabbit fur and the balloon would become positively charged
b) the rabbit fur and the balloon would become negatively charged
c) the rabbit fur would take on a positive charge, and the balloon would take on a negative charge
d) the rabbit fur would take on a negative charge, and the balloon would take on a positive charge
____2. Which of these materials is the best insulator?
a) aluminumc) salt water
b) steel woold) glass

____3. A balloon is rubbed on carpet and assumes a charge. The balloon will stick to all of these except:
a) a metal doorc) a glass window
b) a plaster walld) a wooden cabinet
____4. Object A has a negative charge. Object A is repelled by object B. Object B is attracted to object C and repelled by object D. What are the charges on objects B, C and D?
a) B, C and D are all negativec) B and D are negative, and C is positive
b) B is negative, and C and D are positived) B and D are positive, and C is negative
____5. An object is grounded when it is:
a) directly connected to an insulatorc) directly connected to Earth
b) connected to a source of excess electronsd) connected to a source of excess protons
True or False (8 points)
6. _____Oppositely charged objects are attracted to each other
7. _____In a neutral material, there are always more protons than electrons
8._____Static charges result from an imbalance of protons and neutrons
9._____Electrons cannot easily pass through an insulator
10._____You can charge a material without touching it with a charged rod
11._____A metal can hold a static charge
12._____An object that is charged negatively has an excess of electrons on its surface
13._____Object cannot be charged by friction
Short Answer
14. List three ways that an object can be discharged: (3 points)

i)______
ii)______
iii)______

15. Explain the cause of lightning. Include a diagram. (4 points)

1. Draw in the positive and negative charges in the diagrams of the pith balls below showing the movement of electrons. Also, label whether the two objects will attract or repel. (6 points)

a) approaching a neutral pith ball with a negative ebonite rod

b) then, touching the ball with a negative ebonite rod

c) then, approaching the same pith ball with a positive acetate strip

2. On the diagram of the metal leaf electroscopes below, show the movement of electrons within the electroscope when: (6 points)

a) approaching the ball of a neutral electroscope with a positive ebonite rod (you must draw in the leaves and charges)

b) touching the ball with a positive ebonite rod (you must draw in the leaves and charges)

c) approaching the same electroscope with a negative acetate strip (you must draw in the leaves and charges)

3. On the diagram of the metal leaf electroscope below, show the movement of electrons when: (8 points)
a) approaching the ball of a metal leaf electroscope with a negatively charged ebonite rod. (you must draw in the leaves and charges)

b) grounding the electroscope while holding the negatively charged rod close to the ball of a metal leaf electroscope. (you must draw in the leaves, charges, and the grounding)

c) after the charged rod is removed. (you must draw in the leaves and the charges)

d) charging an object in this way is called (be specific):______
______