A. Where is there a steep cliff? Horiz. coord: 2. Now suppose the figure represe

Question

A. Where is there a steep cliff?
Horiz. coord:

2. Now suppose the figure represents instead a plot of the electric equipotentials for the surface of a glass plate. The numbers now represent voltage. The maximum is 70 V and each contour line from the region marked zero shows a level 10 V higher than the previous.

A. Where would a test charge placed on the glass feel the strongest electric force?
Horiz. coord:

---Select--- A B C D E F G

Verti. coord.:  ---Select--- 1 2 3 4 5 6 7

In what direction would it point? (Take up on the figure as North.)
---Select--- N S E W NE NW SE It is impossible to determine the direction. SW

B. Is there a place on the glass where a charge could be placed so it feels no electric force?

---Select--- Yes No

If so, where?

1. The figure on the right shows a contour plot of a piece of a range of hills in Virginia. The outer part of the figure is at sea level (marked 0). Each contour line from the region marked zero shows a level 10 m higher than the previous. The maximum height is 70 m and is shown by the number 70. Answer the following questions by giving the pair of grid markers (a letter and a number) closest to the point being requested.

A. Where is there a steep cliff?
Horiz. coord:

---Select--- A B C D E F G

Verti. coord.:  ---Select--- 1 2 3 4 5 6 7

B. Where is there a pass between two hills?
Horiz. coord:  ---Select--- A B C D E F G

Verti. coord.:  ---Select--- 1 2 3 4 5 6 7

C. Where is it easiest to begin a climb up the hill?
Horiz. coord:  ---Select--- A B C D E F G

Verti. coord.:  ---Select--- 1 2 3 4 5 6 7 ABC D EFG O 70

Explanation / Answer

1-A ] Horz Cord -B

Vert Cord -2 ( stiff cliff is closed contour]

1-B] HOrz Cord - C. ( two hils spaced shows by contour when contour is suddenly spaced]

Vert Cord - 3

1-C ] Horz Cord - B.

Vert Cord - 1

2-A ] Horz cord -C

Vert Cord - 2

Nortside.

2-B] Yes. charge is proportional to the force hence there is a force.

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