i. Qualitatively (without doing a calculation), would you expect the force of th

Question

i. Qualitatively (without doing a calculation), would you expect the force of the ions (ABC) on ion D to be attractive or repulsive?

A. The force of the ions (ABC) on ion D is attractive.

B. The force of the ions (ABC) on ion D is repulsive.

Explain.

ii. Now do the calculation to find the net force between (ABC) and D. Express your result as a multiple of the combination

F0 =

(Enter the magnitude.)

kce2 /d2 Consider the electric force between four ions on the surface of two large molecules as shown in the figure at the right. The heavy black lines running out of the frame indicate bonds to other atoms in the molecule that we will not consider here. The purple ion in the molecule on the right has a charge e, the red ion in the molecule on the left has a charge -2e and the two green molecules in the molecule on the left each have charges te. A schematic diagram of these ions is shown below indicating relative distances. (a) Consider the following image

Explanation / Answer

force on D = force due to B + force due to A + force due to C

F0 = [ (ke*e / (d^2 +d^2)) (cos45i - sin45 j) ] + [ (k*e*2e / d^2 ) (-i) ] + [ (ke*e / (d^2 +d^2)) (cos45i + sin45 j) ]

F0 = (ke^2 cos45/ d^2 ) i - 2 ke^2/ d^2 i

F0 = - 1.29 ke^2 / d^2 ...............Ans (ii)

(i) attractive force .

III.

B and C will exerts same force but in opposite directions.

so they will get cancel out.

only force due to A remains.

initialy total force was force due to A and minus component of force due to B and C.

so now force will increase . ..........ANs

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