Two point charges of +20.0 C and -8.00 C are separated by a ...

[BrownTown3]

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

[krakiolit]

Answer to Question 1

A

Answer to Question 2

A

[BrownTown3]

Thanks

[krakiolit]

Welcome