The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
a.
D.
b.
E.
c.
F.
d.
G.
e.
H.
b
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In the context of the rings of Saturn, the F ring is clumpy and sometimes appears braided because:
A) of two shepherd satellites. B) resonances with moons remove the gaps in the ring. C) straying particles are gravitationally pulled out of the ring. D) shepherd satellites are absent.
Current estimates place the age of the universe at about ________
A) 14 billion years B) 4 1/2 billion years C) 10 million years D) 10 billion years
The thickness of Earth's crust
A) varies from 10 km under the continents to 60 km under the oceans. B) on average is about 10 km. C) on average is about 60 km. D) varies from 10 km under the oceans to 60 km under the continents.
A(n) ____ is a small circle whose center is located on the circumference of another larger circle
a. equant b. deferent c. retrograde loop d. ellipse e. epicycle