A positively charged insulating rod is brought close to an object that is suspended by a string. If the object is attracted toward the rod we can conclude:
A) the object is positively charged
B) the object is negatively charged
C) the object is an insulator
D) the object is a conductor
E) none of the above
E) none of the above
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An electromagnetic wave has a peak electric field of 3.0 kV/m. What is the intensity of the wave? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A) 24 kW/m2 B) 12 kW/m2 C) 8.0 kW/m2 D) 4.0 kW/m2
Gaps in the asteroid belt (often called Kirkwood gaps) are caused by
A) tidal forces from the Sun. B) tidal forces from Jupiter. C) the competing gravitational tugs of Mars and Jupiter. D) orbital resonances with Jupiter.
An electron determined to be at y = 2.000 ± 0.0010 cm has what minimum uncertainty in velocity?
What will be an ideal response?
A 1.0 m long piece of coaxial cable has a wire with a radius of 1.1 mm and a concentric conductor with inner radius 1.3 mm. The area between the cable and the conductor is filled with a dielectric
If the voltage drop across the capacitor is 6000 V when the line charge density is 8.8 ?C/m, find the value of the dielectric constant. (k = 1/4??0 = 8.99 × 109 N • m2/C2) A) 4.4 B) 4.8 C) 5.3 D) 5.7