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.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 P is directed ... 

The force on a (+) test charge at R is zero.

The magnitude of the charge on the left is ... that on the right.

The sign of the charge on the right is negative.

The magnitude of the E-field at N is ... than at K.

The force on a (-) test charge at S is directed ... 

the following options: (North, South, East, West, Greater than, Less than, Equal to, true, or False)  are possible answers for all of these questions 

Explanation / Answer

The force on a (+) test charge at P is directed **east** since that is the direction of the electric field.

**False**, the force on a (+) test charge at R is not zero, there just happens to be no electric field lines drawn in that region (they are still there!)

The magnitude of the charge on the left is **less than** (about 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 inward.

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 is the direction opposite to the electric field line.

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