Consider point charges of +Q and +4Q, which are separated by 3 m. ...

[V@ndy87]

Consider point charges of +Q and +4Q, which are separated by 3 m. At what point, on a line between the two charges, would it be possible to place a charge of -Q such that the electrostatic force acting on it would be zero?
 
  A) 3/5 m from the +Q charge
  B) 1 m from the +Q charge
  C) 1 m from the +4 charge
  D) 3 m from the +4 charge
  E) There is no such point possible.

Question 2

A heavy bus bar is 20. cm long and of rectangular cross-section, 1.0 cm  2.0 cm. What is the voltage drop along its length when it carries 4000. A? (The resistivity of copper is 1.69  10-8 -m.)
 
  What will be an ideal response?

[Sassygurl126]

Answer to Question 1

B

Answer to Question 2

0.068 V

[V@ndy87]

Great answer, keep it coming

[bassamabas]

Thanks for the timely response, appreciate it