History Of Architecture
Complete the following statement: When a glass rod is rubbed with silk cloth, the rod becomes positively charged as
a) negative charges are transferred from the rod to the silk.
b) negative charges are transferred from the silk to the rod.
c) positive charges are created on the surface of the rod.
d) positive charges are transferred from the silk to the rod.
e) positive charges are transferred from the rod to the silk.
21.3.1. Complete the following statement: When a glass rod is rubbed with silk cloth, the rod becomes positively charged as
a) negative charges are transferred from the rod to the silk.
b) negative charges are transferred from the silk to the rod.
c) positive charges are created on the surface of the rod.
d) positive charges are transferred from the silk to the rod.
e) positive charges are transferred from the rod to the silk.
21.3.4. Three identical conducting spheres on individual insulating stands are initially electrically neutral. The three spheres are arranged so that they are in a line and touching as shown. A negatively-charged conducting rod is brought into contact with sphere A. Subsequently, someone takes sphere C away. Then, someone takes sphere B away. Finally, the rod is taken away. What is the sign of the final charge, if any, of the three spheres?
A
+
B
+
C
−
b) +
−
+
c)
+
0
−
d) −
+
0
−
−
−
a)
e)
21.3.4. Three identical conducting spheres on individual insulating stands are initially electrically neutral. The three spheres are arranged so that they are in a line and touching as shown. A negatively-charged conducting rod is brought into contact with sphere A. Subsequently, someone takes sphere C away. Then, someone takes sphere B away. Finally, the rod is taken away. What is the sign of the final charge, if any, of the three spheres?
A
+
B
+
C
−
b) +
−
+
c)
+
0
−
d) −
+
0
−
−
−
a)
e)
a) negative charges are transferred from the rod to the silk.
b) negative charges are transferred from the silk to the rod.
c) positive charges are created on the surface of the rod.
d) positive charges are transferred from the silk to the rod.
e) positive charges are transferred from the rod to the silk.
21.3.1. Complete the following statement: When a glass rod is rubbed with silk cloth, the rod becomes positively charged as
a) negative charges are transferred from the rod to the silk.
b) negative charges are transferred from the silk to the rod.
c) positive charges are created on the surface of the rod.
d) positive charges are transferred from the silk to the rod.
e) positive charges are transferred from the rod to the silk.
21.3.4. Three identical conducting spheres on individual insulating stands are initially electrically neutral. The three spheres are arranged so that they are in a line and touching as shown. A negatively-charged conducting rod is brought into contact with sphere A. Subsequently, someone takes sphere C away. Then, someone takes sphere B away. Finally, the rod is taken away. What is the sign of the final charge, if any, of the three spheres?
A
+
B
+
C
−
b) +
−
+
c)
+
0
−
d) −
+
0
−
−
−
a)
e)
21.3.4. Three identical conducting spheres on individual insulating stands are initially electrically neutral. The three spheres are arranged so that they are in a line and touching as shown. A negatively-charged conducting rod is brought into contact with sphere A. Subsequently, someone takes sphere C away. Then, someone takes sphere B away. Finally, the rod is taken away. What is the sign of the final charge, if any, of the three spheres?
A
+
B
+
C
−
b) +
−
+
c)
+
0
−
d) −
+
0
−
−
−
a)
e)