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Practice Exam 2_B

# Practice Exam 2_B - 1 A 2-F and a 1-F capacitor are...

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1. A 2- µ F and a 1- F capacitor are connected in series and a potential difference is applied across the combination. The 2- F capacitor has: A) twice the potential difference of the 1- F capacitor B) twice the charge of the 1- F capacitor C) half the potential difference of the 1- F capacitor D) half the charge of the 1- F capacitor E) none of the above 2. What is the resistance in Ohms to current flowing from point P to point Q? P Q 3 4 2 5 A) 3.14 B) 2.22 C) 3.72 D) 3.50 E) 14.0 3. A wire lying along the x-axis carries current in the positive x-direction. The wire is in a region of uniform magnetic field B G . The wire experiences a magnetic force that is directed along the z-direction. Which statement is TRUE concerning the components of the magnetic field. A) B y must be zero B) Both B x and B y must be zero C) Both B x and B z must be zero D) B z must be zero E) B x must be zero 4. A battery charges up a parallel-plate capacitor of capacitance C to a potential difference of V and charge Q. A dielectric slab is then slowly inserted between the plates of the capacitor, while the battery remains attached to it . As the dielectric is being inserted: A) C, V, and Q all increase B) C, V, and Q all decrease C) V increases, Q decreases, and C remains the same D) C and Q decrease, but V remains the same E) C and Q increase, but V remains the same Version 1 Page 1

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5. A typical 100 Watt incandescent light bulb plugged into a 120 V wall outlet glows with a tungsten filament temperature that is close to 2000° C. If the bulb has been off at room temperature the instantaneous power of the bulb immediately after turning on the light switch is about: (the exam cover has some properties of tungsten) A) 3 x 10 1 W B) 1 x 10 2 W C) 3 x 10 2 W D) 3 x 10 3 W E) 1 x 10 3 W 6. Of the following the copper conductor that has the
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Practice Exam 2_B - 1 A 2-F and a 1-F capacitor are...

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