A circular loop of wire of radius 0.50 m is in a uniform magnetic field of 0.30 T. The current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is perpendicular to the magnetic field?
A) zero
B) 0.41 m ? N
C) 0.47 m ? N
D) 0.52 m ? N
E) 0.58 m ? N
A
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Populations within California's Antelope Valley interact with their physical environment (e.g., sunlight and water) to sustain life. Which level of life's organization is appropriate for this scenario?
a. population b. community c. biosphere d. ecosystem e. organism
What is the approximate efficiency of a contemporary steam engine (such as one that drives an electric generator in a power plant)?
a. About 10%. b. About 35%. c. Zero. d. About 50%. e. About 61%.
Find the frequency of X-rays of wavelength 1 Å = 10?10 m
a. 3 × 10^18 Hz b. 3 × 10^10 MHz c. 6 × 10^9 Hz d. 3 × 10^8 Hz e. 3 × 10^20 Hz
The primary mirrors of most radio telescopes is similar to the primary mirror of a reflecting optical telescope in that
a. they are both concave in shape. b. they are both convex in shape. c. they are typically the same size. d. they are both made of metal. e. they have nothing in common.