Two point charges of +20.0 C and -8.00 C are separated by a distance of 20.0 cm. What is the magnitude of electric field due to these charges at a point midway between them? (k = 1/40 = 8.99 109 N m2/C2)
A) 25.2 106 N/C directed toward the negative charge
B) 25.2 106 N/C directed toward the positive charge
C) 25.2 105 N/C directed toward the negative charge
D) 25.2 105 N/C directed toward the positive charge
E) 25.2 104 N/C directed toward the negative charge
Question 2
A rod has a length 2.00000 m at 10.0C. The length of the rod increases to 2.00060 m when the temperature increases to 30.0C. What is the coefficient of linear expansion of the material from which the rod is made?
A) 1.5 10-5/K
B) 1.0 10-5/K
C) 1.0 10-3/K
D) 2.5 10-5/K
E) 2.0 10-5/K
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