A parallel-plate capacitor, with air between the plates, is connected across a voltage source. This source establishes a potential difference between the plates by placing charge of magnitude 4.15 × 10-6 C on each plate
The space between the plates is then filled with a dielectric material, with a dielectric constant of 7.74. What must the magnitude of the charge on each capacitor plate now be, to produce the same potential difference between the plates as before?
3.21 × 10-5 C
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Compound Microscope: The objective lens of a microscope has a focal length of 2.4 mm and the eyepiece has an angular magnification of 15. The object is positioned 0.060 mm beyond the focal point of the objective. The focal point of the eyepiece is positioned at the real image formed by the objective. The near point of the microscope user is at 25 cm. The magnitude of the overall magnification of the microscope is closest to
A. 400. B. 450. C. 500. D. 550. E. 600.
The fact that large elliptical galaxies are much more common in the central regions of galaxy clusters than elsewhere in the universe suggests that
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A spring scale typically indicates the magnitude of the tension force exerted on its bottom hook. What will the scale read in each of the cases shown in the diagram?
A. 49 N
B. 98 N
C. 196 N
D. Other (specify)
On the H-R diagram, white dwarfs lie Sirius B and Procyon B lie
A) at the top left. B) at the top right. C) close to the Sun, near the center. D) at the lower left. E) at the lower right.