An air-core inductor has 920 turns/m and an internal volume of 3.0 cm3 . What is its inductance?
a. 3.2 ?H
b. 2.8 mH
c. 0.35 H
d. 32 ?H
e. Insufficient information is given.
a
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A compass with its needle pointing north sits on a table. We place a straight wire over the compass perpendicular to its needle. We then send a conventional current running west to east through the wire. How does the compass needle respond to the current?
A. The compass needle deflects toward the west. B. The compass needle deflects toward the east. C. The compass needle does not do anything. D. The compass needle turns around to point south.
Based on its surface temperature of 5,800 K, what color are most of the photons that leave the Sun's surface?
A) blue B) red C) yellow D) orange E) green
__________ results because the speed of light in a transparent medium varies with frequency
Fill in the blank(s) with correct word
Molten rock material on Earth's surface is called
a. magma. b. lava. c. pluton. d. silica.