Take 10 Week #10 SPS 10-electromagnetism Physical Science

Day # 1 Question 1 The two resistors shown are connected to identical power sources. Resistor 1 has a resistance of 30Ω, and resistor 2 has a resistance of 45 Ω. The current in resistor 1 is 2 A. What is the current in resistor 2? A. 1.0 A B. 1.3 A C. 1.5 A D. 3.0 A

Day # 1 Question 2 The graph relates the current to voltage data for a resistor. Which of the following is the value of the resistor? 0.2 Ω B. 2 Ω C. 4 Ω D. 10 Ω

Day # 1 Answers 1. What is the current in resistor 2? B. 1.3 A 2. Which of the following is the value of the resistor? D. 10 Ω

Day # 2 Question 1 Which of the following best describes the movement of charges as this glass rod touches the sphere? A. Negative charges move from the sphere to the glass rod. B. Negative charges move from the glass rod to the sphere. C. Positive charges move from the sphere to the glass rod. D. Positive charges move from the glass rod to the sphere. The figure shows a neutral glass rod and a positively charged metal sphere.

Day # 2 Question 2 An electric circuit is shown below. The accompanying table shows the current measured at different levels of resistance. Based on the data shown in the table, what is the voltage drop across the variable resistor? A. 1.5 V B. 6 V C. 9 V D. 12 V

Day # 2 Answers 1. Which of the following best describes the movement of charges as this glass rod touches the sphere? B. Negative charges move from the glass rod to the sphere. 2. Based on the data shown in the table, what is the voltage drop across the variable resistor? A. 1.5 V

Day # 3 Question 1 If one light bulb is removed, which of the following could replace it so that the remaining light bulb is dimmer? In the diagram, the circuit has one battery and two identical light bulbs.

Day # 3 Question 2 Which of the following ammeters is shown with an incorrect reading?

Day # 3 Answers 1. If one light bulb is removed, which of the following could replace it so that the remaining light bulb is dimmer? 2. Which of the following ammeters is shown with an incorrect reading?

Day # 4 Question 1 A magnetic compass is placed near an insulated copper wire. When the wire is connected to a battery, the compass needle changes position. Which of the following is the best explanation for the movement of the needle? A. The copper wire magnetizes the needle to create a force. B. The needle magnetizes the copper wire to create a force. C. The current in the wire produces a magnetic field and exerts a force on the needle. D. The insulation on the wire becomes energized and exerts a force on the needle.

Day # 4 Question 2 The power of a toaster can be determined if which of the following values are known? A. the dimensions of the toaster B. the resistance of the toaster’s insulation C. the voltage applied to the toaster and the toaster’s temperature D. the current through the circuit and the voltage applied to the toaster

Day # 4 Answers 1. Which of the following is the best explanation for the movement of the needle? C. The current in the wire produces a magnetic field and exerts a force on the needle. 2. The power of a toaster can be determined if which of the following values are known? D. the current through the circuit and the voltage applied to the toaster

Day # 5 Question 1 An ammeter measures the current in the circuit shown When the piece of wire labeled X is replaced by a second identical R, which of the following happens to the current? A. It increases. B. It decreases. C. It goes to zero. D. It remains unchanged

Day # 5 Question 2 You remove the plastic wrapping from a CD. The pieces of wrap cling to her hand. Which of the following forces causes the wrap to cling to her hand? A. electrostatic B. gravitational C. magnetic D. net

Day # 5 Answers 1. When the piece of wire labeled X is replaced by a second identical R, which of the following happens to the current? B. It decreases. 2. A teenager removes the plastic wrapping from a CD. The pieces of wrap cling to her hand. Which of the following forces causes the wrap to cling to her hand? A. electrostatic