The magnetic flux through a coil changes steadily from 4.0 × 10-5 T ? m2 to 5.0 × 10-5 T ? m2 in 0.10 s. What emf is induced in this coil?
A) 5.0 × 10-4 V
B) 4.0 × 10-4 V
C) 1.0 × 10-4 V
D) None of the given answers are correct.
C
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What is the approximate efficiency of a contemporary steam engine (such as one that drives an electric generator in a power plant)?
a. About 10%. b. About 35%. c. Zero. d. About 50%. e. About 61%.
Predict the next panel in the spectral sequence of the binary star system shown above
a. a
b. c
c. b
d. None of the other choices are correct.
Four 2.0-µC point are at the corners of a rectangle with sides of length 3.0 cm and 4.0 cm. What is the electric potential (relative to infinity) at the midpoint of the rectangle? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 1.3 MV B) 2.9 MV C) 3.5 MV D) 7.8 MV
Which is the MOST important property of the element carbon that makes it ideal as a fundamental building block of biological molecules?
A) it is a very stable element B) it is the only element capable of bonding to itself C) it is a common element D) it readily forms chemical bonds with itself and other elements, allowing a wide variety of complex molecules to form