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Molecular E-forces

Page history last edited by Joe Redish 3 years, 7 months ago

4.2.4.P12

 

In the figure at the right are shown three molecules, each consisting of two positive ions of charge +e and a negative ion of charge -2e. The distance scale is given by the grid, each box having a height and width equal to d. For each problem, place your answer on the line to the left of the question. Answer each of the three questions below by choosing a symbol for the appropriate direction: points to the left (←),points to the right (→), points up (↑), or points down (↓), or is zero (0).

 

  1. The direction of the net electrical force of the molecule on a positive charge placed at the x in situation #1.
  2. The direction of the net electrical force of the molecule on a positive charge placed at the x in situation #2.
  3. The direction of the net electrical force of the molecule on a positive charge placed at the x in situation #3.

 

Complete each of the two sentences below by choosing a symbol for the appropriate relation: is greater than (>), is equal to (=), is less than (<), or cannot be determined (?). 

 

  1. In situation #1, the magnitude of the force on a positive test charge at the x from the negative ion B is ___ the magnitude of the force on that test charge from the positive ion C.
  2. In situation #3, the magnitude of the force on a positive test charge at the x from the two positive ions G and I is ___ the magnitude of the force on a positive test charge at the x from the two positive ions E and F in situation #2.

 

 

Joe Redish 1/15/13

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