A parallel-plate capacitor has a capacitance of 10 mF and is charged with a 20-V power supply. The power supply is then removed and a dielectric material of dielectric constant 4.0 is used to fill the space between the plates
What is the voltage now across the capacitor? A) 80 V
B) 20 V
C) 10 V
D) 5.0 V
E) 2.5 V
D
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The interface between two crystals in a polycrystalline single phase solid is a(n) _____________boundary.
Fill in the blank(s) with the appropriate word(s).
An object is placed in front of a thin lens. Which statements are correct in describing the image formed by the lens?
A. If the lens is convex, the image will never be virtual. B. If the image is real, then it is also inverted. C. If the image is real, then it is also upright. D. If the lens is concave, the image must be virtual. E. If the lens is convex, the image must be real.
A superconducting wire carries a current of 7.0 kA. Find the magnetic field at a distance of 1.5 m from the wire. (µ0 = 4? × 10^?7 T?m/A)
a. 9.3E–4 T b. 3.0E–4 T c. 2.9E–3 T d. 1.5E–3 T e. 5.9E–3 T
A turntable has a moment of inertia of 3.00 × 10^?2 kg·m2 and spins freely on a frictionless bearing at 25.0 rev/min. A 0.600-kg ball of putty is dropped vertically on the turntable and sticks at a point 0.100 m from the center. By what factor does the angular momentum of the system change after the putty is dropped onto the turntable?
a. 1.22 b. 1.00 (no change) c. 0.820 d. 1.20