______ navigation uses a website visitor's browsing or search history to provide content suggestions.
A. Primary
B. Subsidiary
C. Contextual
D. Adaptive
Answer: C
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The apparent brightness of a star is 1.0 × 10-12 W/m2 and the peak wavelength is 600 nm. Estimate its distance from us
A) 0.090 pc B) 0.90 pc C) 9.0 pc D) 90 pc E) 900 pc
Two vectors lying in the xz plane are given by the equations 
and 
. The value of 
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B.
C.
D.
E.
A long, straight wire (radius = 2.0 mm) carries a current of 2.0 A distributed uniformly over a cross section perpendicular to the axis of the wire. What is the magnitude of the magnetic field at a distance of 1.0 mm from the axis of the wire?
a. 0.40 mT b. 0.80 mT c. 0.10 mT d. 0.20 mT e. 0.75 mT
The maximum torque on a current carrying loop occurs when the angle between the loop's magnetic moment and the magnetic field vector is
A) 0° B) 45° C) 90° D) 180° E) none of the given answers