at point b? 
A. ?0 I/4?R
B. ?0 I/2?R
C. ?0 I/?R
D. ?0 I/R
E. (2 + ?)?0 I/4?R
F. Zero
C. ?0 I/?R
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In the context of giant stars, helium fusion produces _____ that accumulate in an inert core
A) nitrogen and carbon B) hydrogen and neon C) oxygen and neon D) carbon and oxygen
The second brightest object in the sky is
a. the Sun. b. the Moon. c. Venus. d. Mars.
How many calories of heat are required to raise the temperature of 4 kg of water from 50°F to the boiling point?
A. 6.5 × 105 B. 3.6 × 105 C. 15 × 105 D. 360 E. 4 × 104
Starting from rest, an electron accelerates through a potential difference of 51.6 V. What is its de Broglie wavelength? (h = 6.63 × 10^?34 J?s, me = 9.11 × 10^?31 kg, and 1 eV = 1.60 × 10^?19 J)
a. 4.4E+13 m b. 2.4E–10 m c. 1.7E–10 m d. 1.1E–24 m e. 2.6E–11 m