Magnetic Field of a Long Wire: A long straight wire carrying a 4-A current is placed along the x-axis as shown in the figure. What is the magnitude of the magnetic field at a point P, located at y = 2 cm, due to the current in this wire? (?0 = 4? × 10-7 T ? m/A)
A. 20 ?T
B. 30 ?T
C. 40 ?T
D. 50 ?T
E. 60 ?T
Answer: C
Physics & Space Science
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Sebastian has drawn a free-body diagram for a ladder of mass m leaning against a frictionless wall. His diagram is shown below. What is his error?
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A.
B.
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D.
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How many valence electrons does boron (B, atomic no. = 5) have?
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Rank the degenerate pressures from least supportive to most supportive:
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