Resistance and Resistivity: The length of a certain wire is doubled while its radius is kept constant. What is the new resistance of this wire?
A. It stays the same.
B. It is 2 times as large.
C. It is 3 times as large.
D. It is 4 times as large.
E. It is ½ as large.
Answer: B
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Components: The x component of vector 
is 5.3 units, and its y component is -2.3 units. The angle that vector 
makes with the +x-axis is closest to
A. 340°. B. 160°. C. 250°. D. 110°. E. 23°.
Intensity: The maximum value of the electric field in an electromagnetic wave is 2.0 V/m. What is the maximum value of the magnetic field in that wave? (c = 3.0 × 108 m/s)
A. 6.7 pT B. 6.7 mT C. 6.7 nT D. 6.7 ?T E. 6.7 T
When ice crystals form in clouds, the surrounding air
A) warms. B) cools. C) neither of these
Two charges of 15 pC and -40 pC are inside a cube with sides that are of 0.40-m length. Determine the net electric flux through the surface of the cube
a. +2.8 N × m2/C b. -1.1 N × m2/C c. +1.1 N × m2/C d. -2.8 N × m2/C e. -0.47 N × m2/C