Two long parallel wires carry unequal currents in the same direction. The ratio of the currents is 3 to 1 . The magnitude of the magnetic field at a point in the plane of the wires and 10 cm from each wire is 4.0 ?T. What is the larger of the two currents?
a. 5.3 A
b. 3.8 A
c. 4.5 A
d. 3.0 A
e. 0.5 A
d
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Intensity of Sound: A sound of 40 decibels is
A. twice as intense as a sound of 20 decibels. B. four times as intense as a sound of 20 decibels. C. 10 times as intense as a sound of 20 decibels. D. 100 times as intense as a sound of 20 decibels. E. 1000 times as intense as a sound of 20 decibels.
Which of the following best describes the current status of our understanding of the solar neutrino problem?
A) Experimental evidence indicates that the problem is solved and the expected number of solar neutrinos are indeed being produced by the Sun. B) The problem arose only because experimental data were being misinterpreted; on re-examination, the old data showed that the expected number of neutrinos were being detected. C) We have learned that the Sun's interior undergoes fusion at a lower rate than we had expected, and that is why we had observed fewer neutrinos than expected. D) The solar neutrino problem remains as perplexing as ever, and indeed makes everything we think we know about stars suspect.
The circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second then its linear speed is
A) 1 m/s. B) 2 m/s. C) 3 m/s. D) 3.14 m/s. E) 6.28 m/s.
What happened in the Planck Era? At what temperature did it end?
What will be an ideal response?