Question

1. (3 points) Metal spheres 1 and 2 are touching. Both are initially neutral. A negative charged plastic rod is brought near Sphere 1, but not touching it as shown in Figure 1. With the plastic rod in place the spheres are separated. The plastic rod is then removed. 1 2 Figure 1 After the plastic rod is removed, the charges on the two metal spheres, Q1 and Q2, are (A) Q1 is +, Q2 is - (B) Q1 is -, Q2 is - (C) Q1 = Q2 = 0 (D) Q1 is +, Q2 is + (E) Q1 is -, Q2 is + 2. (4 points) Figure 2 shows an electroscope that is charged, but the charge is unknown. When a positively charged glass rod is brought close to the top of the electroscope without touching it, the leaves of the electroscope get closer together. ? ?? ?/? Figure 2 The charge on the electroscope must be (A) positive (B) negative (C) zero (D) either positive or negative.

          1. (3 points) Metal spheres 1 and 2 are touching. Both are initially neutral. A negative charged plastic rod is brought near Sphere 1, but not touching it as shown in Figure 1. With the plastic rod in place the spheres are separated. The plastic rod is then removed.

1 2
Figure 1
After the plastic rod is removed, the charges on the two metal spheres, Q1 and Q2, are
(A) Q1 is +, Q2 is - (B) Q1 is -, Q2 is - (C) Q1 = Q2 = 0 (D) Q1 is +, Q2 is + (E) Q1 is -, Q2 is +

2. (4 points) Figure 2 shows an electroscope that is charged, but the charge is unknown. When a positively charged glass rod is brought close to the top of the electroscope without touching it, the leaves of the electroscope get closer together.

?
??
?/?
Figure 2
The charge on the electroscope must be
(A) positive (B) negative
(C) zero (D) either positive or negative.

1. (3 points) Metal spheres 1 and 2 are touching. Both are initially neutral. A negative charged plastic rod is brought near Sphere 1, but not touching it as shown in Figure 1. With the plastic rod in place the spheres are separated. The plastic rod is then removed.

1 2
Figure 1
After the plastic rod is removed, the charges on the two metal spheres, Q1 and Q2, are
(A) Q1 is +, Q2 is - (B) Q1 is -, Q2 is - (C) Q1 = Q2 = 0 (D) Q1 is +, Q2 is + (E) Q1 is -, Q2 is +

2. (4 points) Figure 2 shows an electroscope that is charged, but the charge is unknown. When a positively charged glass rod is brought close to the top of the electroscope without touching it, the leaves of the electroscope get closer together.

?
??
?/?
Figure 2
The charge on the electroscope must be
(A) positive (B) negative
(C) zero (D) either positive or negative.

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