A point charge of +3.0 mC is located at the origin of a ...

[beccaep]

A point charge of +3.0 mC is located at the origin of a coordinate system and a second point charge of -9.0 mC is at x = 1.0 m. At what point on the x axis is the electrical potential zero?
 a. +0.33 m
  c. +0.25 m
  b. -0.25 m
  d. +0.75 m

Question 2

A 0.12-m radius grinding wheel takes 2.1 s to speed up from 2.0 rad/s to 11.0 rad/s. What is the wheel's average angular acceleration?
 a. 9.6 rad/s2
  c. 1.6 rad/s2
  b. 4.3 rad/s2
  d. 0.33 rad/s2

[vish98]

Answer to Question 1

C

Answer to Question 2

B