Charge of uniform density (20 nC/m2) is distributed over a cylindrical surface (radius = 1.0 cm), and a second coaxial surface (radius = 3.0 cm) carries a uniform charge density of ?12 nC/m2 . Determine the magnitude of the electric field at a point 2.0 cm from the symmetry axis of the two surfaces
a. 2.3 kN/C
b. 1.1 kN/C
c. 1.7 kN/C
d. 3.4 kN/C
e. 4.5 kN/C
b
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RLC Circuits: The figure shows a series ac circuit. The inductor has a reactance of 50 ? and an inductance of 220 mH. An 80-? resistor and a capacitor whose reactance is 160 ? are also in the circuit, and the rms current in the circuit is 2.2 A. What is the voltage amplitude across the capacitor?
A. 390 V B. 330 V C. 270 V D. 220 V E. 190 V
Pangaea is believed to have broken up about how many years ago?
a. 2000 million b. 2 million c. 20 million d. 200 million
Two objects made from the same material have different masses and different initial temperatures as shown. If the bodies are placed in thermal contact, the final equilibrium temperature is most nearly: