How do you find the direction of E+, E- and E? Why are they all facing different

Question

How do you find the direction of E+, E- and E? Why are they all facing different directions? Do you assume a polarity for the point P?

UNIVERSITY0 LIVERPOC Example 4Field under a d.c transmission line Two long parallel conductors of a d.c transmission line separated by 2 m have charges of 5 Cm-lof opposite sign. Both lines are 8 m above ground. Calculate the magnitude of the electric field 4 m directly below is of the wires. &=1 E Field due to +ve charge and -ve Charges - E +E 2 0 -(x sin -y cos 42 +2-./20 = 4.47m r =

Explanation / Answer

The line joining from point P to positive terminal decide E+ direction and two positive charge repels so we consider it going away from p in the diection of line joining p to +.

The line joining from p to - determine E- direction and positive and negative attracts so its in the direction line joining p to -.

E direction is determined by drawing parallel line to direction of E- from E+ and another parallel line to direction of E+ from E-. An draw a line joining p and point where the two parallel line meets is the direction of E.

Yes we assume the polarity of point P as positive.

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