Question

4. If there are two parallel lines of charge q that are of opposite signs and are close together, what are the potential and electric field at the midpoint between the two lines?

   1. a) ?=0,?=0

   2. b) ?≠0,?=0

   3. c) ?=0,?≠0

   4. d) ?≠0,?≠0

   5. e) Can not be determined

5. 7) If there are two parallel lines of charge q that have the same sign and are close together, what are the potential and electric field at the midpoint between the two lines?

   1. a) ?=0,?=0

   2. b) ?≠0,?=0

   3. c) ?=0,?≠0

   4. d) ?≠0,?≠0

   5. e) Can not be determined

Answer 1

6)
c) V = 0 , E is not equal to zero

Becasue, at mid point the two wires produce same amount of elctric field in the direction of negative charged line.

so, net elctric field does not becomes zero.

at mid point positive charged wire produce positive potential and negative charged wire produce negative potential.

so, net potential becomes zero.

7)
b) V is not equal to zero, E = 0

Because, at mid point both wires produce equal ampuint of elctric field but in the opposite direction.

so, net electric field is zero.

at mid point Both wires produce same amount of positive potential. so, net potential does not become zero.