Four equal +6.00-?C point charges are placed at the corners of a square 2.00 m on each side. (k = 1/4??0 = 8.99 × 109 N • m2/C2)
(a) What is the electric potential (relative to infinity) due to these charges at the center of this square?
(b) What is the magnitude of the electric field due to these charges at the center of the square?
(a) 153 kV (b) zero
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Faraday's law of induction states that the emf induced in a loop of wire is proportional to
A) current divided by time. B) the magnetic flux. C) the time variation of the magnetic flux. D) the magnetic flux density times the loop's area.
Plane polarized light of intensity 
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A. 0.70 
B. 0.50
C. 0.35 
D. 0.25 
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