A long conducting circular rod is inside a long conducting square enclosure. The

Question

A long conducting circular rod is inside a long conducting square enclosure.

The rod is maintained at a potential of -5000 volts with respect to the square which is grounded (V=0). The contour lines are equipotentials with V = -4000, -3000, -2000, and -1000 volts.

PART A

Select a response for each statement below. (Use 'N', North, towards top of page (+y dir), and 'E', East, to the right (+x dir), 'NE' for in between 'N' and 'E', etc.) OR True/False

1) The magnitude of the E-field at 5 is greater than that at 7 .

2) The y-component of the E-field at 5 is zero.

3) The direction of the force on a small (+) charge at 5 is ....

4) The direction of the force on a small (-) charge at 9 is ....

5) The magnitude of the E-field at 6 is very small (~ zero).

6) The direction of the E-field at 3 is ....

7) The x-component of the E-field at 7 is positive.

Explanation / Answer

1.Yes it is true. Since 6 is very distant from the source charge.

2. This is correct.

3. This correct as well

4. This one is wrong. The magnitude of the electric field depends on the distance of the point from the source charge. In this case the radial distance of point 7 is smaller than that of point 2. Hence electric field at 7 is higher.

5. Correct.

6. Yes it is definitely true.

7. Yes it is correct.

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