A long solenoid (n = 1200 turns/m, radius = 2.0 cm) has a current of a 0.30 A in its winding. A long wire carrying a current of 20 A is parallel to and 1.0 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the solenoid?
a. 0.60 mT
b. 0.85 mT
c. 52 ?T
d. 0.40 mT
e. 0.75 mT
a
Physics & Space Science
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a. 
b. 
c. 
d. 
e. 
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How do we know how old the Sun is?
A) from radiometric dating of solar system meteorites B) from Newton's version of Kepler's third law and the orbits of the planets C) from calculating its fuel supply and how fast it is using it up D) from its speed and distance from us E) from radiometric dating of particles in the solar wind
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The glare seen from water is largely
A) horizontally polarized. B) vertically polarized. C) unpolarized.
Physics & Space Science
The larger the ripple voltage, the better the filter.
a. True b. False
Physics & Space Science