Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude F due to the other. With time, charge gradually leaks off of both spheres
When each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be A) 1/16 F.
B) 1/8 F.
C) 1/4 F.
D) 1/2 F.
C
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Series/Parallel Circuits: What current flows from the battery in the circuit shown in the figure? The battery is ideal, and all the numbers are accurate to two significant figures.
A. 0.35 A B. 2.0 A C. 2.5 A D. 3.0 A
Kirchhoff was the first to describe qualitatively the types of spectra we observe from luminous objects. Describe the three types and their sources
What will be an ideal response?
The pulsations from a neutron star are due to
A) the gas that surrounds it. B) its large mass. C) its rapid spinning motion. D) the vibrations of its neutrons. E) the nuclear reactions taking place in its center.
A slide projector needs to focus the image of a 24 mm × 36 mm slide onto a square screen 1.50 m on each side. You want to fill the screen as completely as possible without any of the image falling beyond the screen
Due to space constraints in the projector, the slide must be placed 10.5 cm from the lens. (a) What magnification does the projector produce? (b) How far from the lens should the screen be placed? (c) What focal length projector lens is needed?