Potential of Point-Charges: Four point charges of magnitude 6.00 ?C and are at the corners of a square 2.00 m on each side. Two of the charges are positive, and two are negative. What is the electric potential at the center of this square, relative to infinity, due to these charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A. 76.4 kV
B. 0 V
C. 153 kV
D. 61.0 kV
E. 306 kV
Answer: B
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Resistance and Resistivity: A 1.0-mm diameter extension cord is made of metal having a resistivity of 1.68 × 10-8 ? ? m. When it carries a current of 15 A, what is the potential difference between two points in the cord that are 100 m apart?
A. 12 V B. 23 V C. 32 V D. 41 V
Fanning out of waves upon passing through an opening is more pronounced through
A) small openings. B) large openings. C) same for each D) none of the above
The instability strip is above the main sequence on the H-R diagram
Indicate whether the statement is true or false
If the scalar (dot) product of two vectors is negative, it means that
a. there was a calculator error. b. the angle between the vectors is less than 90 degrees. c. the angle between the vectors is 90 degrees. d. the angle between the vectors is greater than 270 degrees. e. the angle between the vectors is between 90 and 180 degrees.