Two long, parallel wires each carry the same current I in the same direction (Fig. OQ30.4). The total magnetic field at the point P midway between the wires is:
1
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Which of the following is not a major pattern of motion in the solar system?
A) Nearly all comets orbit the Sun in same direction and roughly the same plane. B) Most of the solar system's large moons orbit in their planet's equatorial plane. C) The Sun and most of the planets rotate in the same direction in which the planets orbit the Sun. D) All of the planets orbit the Sun in the same direction—counterclockwise as viewed from above Earth's north pole.
One long wire carries a current of 30 A along the entire x axis. A second long wire carries a current of 40 A perpendicular to the xy plane and passes through the point (0, 4, 0) m. What is the magnitude of the resulting magnetic field at the point y = 2.0 m on the y axis?
a. 4.0 ?T b. 5.0 ?T c. 3.0 ?T d. 7.0 ?T e. 1.0 ?T
The significance of a Carnot engine is that
A. all automobiles operate on the Carnot cycle B. it has the maximum possible efficiency of any engine operating between the same two temperatures C. it violates the second law of thermodynamics D. it violates the first law of thermodynamics
All type I supernovae are caused by white dwarfs
a. True b. False Indicate whether the statement is true or false