Impedance: In a series RLC ac circuit, a second resistor is connected in parallel with the resistor previously in the circuit. As a result of this change, what happens to the impedance of the circuit?
A. It increases.
B. It decreases.
C. It does not change.
D. It increases for frequencies below resonance and decreases for frequencies above resonance.
E. It decreases for frequencies below resonance and increases for frequencies above resonance.
Answer: B
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Thin Lenses: A convex lens has focal length f. If an object is placed at a distance of 2f from the lens on the principal axis, the image is located at a distance from the lens
A. of 2f. B. between f and 2f. C. of f. D. between the lens and f. E. of infinity.
Video 1 (Chapter 19): If the lens of the eye cannot adjust enough to focus on a distant object, what kind of lens should be added to the optical system?
A. Converging lens B. Diverging lens C. A combination of a converging and a diverging lens. D. No lens can fix this.
A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is negative. The sphere is
A. rotating clockwise and slowing down. B. rotating counterclockwise and slowing down. C. rotating clockwise and speeding up. D. rotating counterclockwise and speeding up. E. first rotating counterclockwise and then clockwise.
A high-voltage power line 23.0 m above the ground carries a current of 2 200 A. What is the magnetic field due to the current directly underneath the power line? (µ0 = 4? × 10^?7 T?m/A)
a. 19.1 µT b. 60.1 µT c. 60.9 mT d. 12.0 mT e. 12.0 T