The Dynamo Theory holds that
A) lightning plays a major role in generating our magnetic fields.
B) any other planet of similar density will also have a strong magnetic field.
C) the Earth's core, like Mercury's, is now a solid, rigid bar magnet.
D) magnetic fields are generated by rapidly spinning, fluid magnetic interiors.
E) the Earth's magnetic field must switch polarities every few million years.
D
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The area of a rectangular loop of wire is 3.6 × 10-3 m2. The loop is placed in a magnetic field that changes from 0.20 T to 1.4 T in 1.6 s. The plane of the loop is perpendicular to the direction of the magnetic field
What is the magnitude of the induced emf in that loop? A) 2.8 × 10-3 V B) 2.7 × 10-3 V C) 0 V D) 1.8 × 10-3 V E) 3.0 × 10-3 V
The force on your left palm is __________ the force on your right palm
Fill in the blank(s) with correct word
Polarization is a property of
A) transverse waves. B) longitudinal waves. C) both of these D) neither of these
Why does Jupiter have three distinct layers of clouds?
A) Clouds form randomly, so on average there are always three layers. B) The three layers represent clouds made of gases that condense at different temperatures. C) Jupiter has three different types of wind, each of which makes a different type of cloud. D) The three layers reflect regions of Jupiter's atmosphere with different overall chemical compositions.