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
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Name four properties of Mars that are similar to those of Earth today.
a. Magnetic field; average density; atmospheric chemical composition; active water erosion of the surface. b. Differentiated body; location in the Solar System; has weather and seasons; surface temperatures can be Earthlike. c. Differentiated body; location in the Solar System; atmospheric chemical composition; active water erosion of surface. d. Magnetic field; average density; has weather and seasons; surface temperatures can be Earthlike.
If a beam of electromagnetic radiation has an intensity of 120 W/m2, what is the maximum value of the electric field? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2)
A) 1.5 kV/m B) 1.0 µT C) 1.0 µV/m D) 0.30 kV/m E) 0.0032 V/m
A light bulb with a tungsten filament is attached to a source of variable voltage. As the voltage is increased on the bulb,
a. the bulb's resistance decreases. b. the bulb's resistance increases. c. the power dissipated remains constant. d. the current in the bulb decreases.
A lens that is thinner at the center than the edges
a. is a converging lens. b. is a diverging lens. c. always forms a real image. d. always forms a virtual image. e. none of the above