Interpreting a field line diagram of many charges. A distribution of 14 charges

Question

Interpreting a field line diagram of many charges. A distribution of 14 charges (two vertical rows of 7 charges each) produces the following field line diagram. What does the field line diagram say about the E field at the center of the diagram? Do the two vertical lines of charge have the same sign of charge or opposite sign? Each charge on the left is 1 mu C. As seen from far from the distribution, these 14 charges look like a: Exercise 4. Electric fields near conductors. Below is shown the field line diagram for a point charge above a horizontal conducting sheet. (The sheet is at the very bottom.) What do you notice about the direction of the field lines at the surface of the conductor? (Answer in a way that is independent of how the conductor is positioned - e.g., make sure your answer still holds if the conductor were vertical instead of horizontal.) Give a reason why a static E field must always be positioned that way at the surface of a conductor. (Think about the consequences of an E field along the surface.)

Explanation / Answer

the field at the centre of the diagram = zero.a sthere are noo field lines. they have the same sign, as they are not intersecting with eachother. it looks like a positive charge with field lines emerging from the centre, with magnitude, 14 microcoulumbs. the field lines at the surface of the conductor are perpendicular t the surfece. as the conductor is an equipotential surface. if the field is not perpendicular, there will be a constant work done on the electronds on the surface of the conductor which requires constant energy, and also constant heat loss occurs due to the moving of electrons which constitute a current,

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