The electric field from two charges in the plane of the paper is represented by

Question

The electric field from two charges in the plane of the paper is represented by the dashed lines and arrows below.
http://i40.tinypic.com/34ywx83.png

Select the best response for each statement below. (Use 'North' towards top of page, and 'East' to the right.)

The force on a (+) test charge at N is directed ...
The force on a (+) test charge at J is zero.
The magnitude of the charge on the right is ... that on the left.
The magnitude of the E-field at L is ... than at K.
The force on a (-) test charge at M is directed ...
The sign of the charge on the left is negative.


(The options for each one are, East, West, North, South, Greater than, Less than, Equal to, True, False)

Explanation / Answer

Answer according Question

The force on a (+) test charge at P is directed east since that is direction of the electric field.
False, The force on a (+) test charge at R not zero. There just happens to be no Electric field lines drawn that region
The magnitude of the charge on the left is less than ( 13/18 times ratio of electric fields of each ) than the charge on the right.
True, The sign   of the charge on the right is negative    because the Electric field lines point in ward.
The magnitude of the electric field at N is **less than** the electric field at K, because K is closer to the point charge than N.
The force on a (-) test charge at S is directed north because that the direction opposite to the Electric field line.

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