Multiple Choice
Two point charges are fixed on the y-axis at positions and . If both charges have magnitude but opposite signs, what is the direction of the electric field at the origin?
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24. Electric Force & Field; Gauss' Law
Electric Charge
Multiple Choice
A glass rod is rubbed with silk, and a plastic rod is rubbed with wool. Afterward, to which object or objects will the glass rod be attracted?
A
The silk only.
B
The wool only.
C
The plastic rod only.
D
Both the silk and the wool.
E
The silk, the wool, and the plastic rod.
F
The silk and the plastic rod.
Verified step by step guidance1
Understand the concept of charging by friction: When two different materials are rubbed together, electrons are transferred from one material to the other, resulting in one object becoming positively charged and the other negatively charged.
Identify the charges: When a glass rod is rubbed with silk, electrons are transferred from the glass to the silk, making the glass rod positively charged and the silk negatively charged.
Analyze the plastic rod and wool interaction: When a plastic rod is rubbed with wool, electrons are transferred from the wool to the plastic rod, making the plastic rod negatively charged and the wool positively charged.
Determine attraction based on opposite charges: Since opposite charges attract, the positively charged glass rod will be attracted to the negatively charged plastic rod.
Consider the silk: The glass rod will also be attracted to the negatively charged silk, as opposite charges attract. Therefore, the glass rod will be attracted to both the silk and the plastic rod.
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