Thin Lenses: An image is 4.0 mm in front of a converging lens with focal length of magnitude 5.0 mm. Where is the object for this image?
A. 2.2 mm in front of the lens
B. 2.2 mm behind the lens
C. 9.0 mm behind the lens
D. 20 mm in front of the lens
Answer: A
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Potential of Point-Charges: Two 3.0 ?C charges lie on the x-axis, one at the origin and the other at 2.0 m. What is the potential (relative to infinity) due to these charges at a point at 6.0 m on the x-axis? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 11,000 V B. 9000 V C. 14,000 V D. 3400 V
Two mirrors are at right angles to one another. A light ray is incident on the first at an angle of 30° with respect to the normal to the surface. What is the angle of reflection from the second surface?
a. 30° b. 60° c. 45° d. 53° e. 75°
At a distance of 4.3 cm from the center of a very long uniformly charged wire, the electric field has magnitude 2000 N/C and is directed toward the wire
What is the charge on a 1.0 cm length of wire near the center? (?0 = 8.85 × 10-12 C2/N ? m2) A) -0.056 nC B) -0.044 nC C) -0.048 nC D) -0.052 nC
Earth's magnetic field is not stable; throughout geologic time it has changed direction. This change is attributed to
A) changes in the direction of fluid flow in the molten outer core of Earth. B) magnetic pole reversals. C) fluctuations in the time / space continuum. D) changes in the direction of fluid flow in the molten inner core of Earth.