A long conducting cylindrical rod is inside a long conducting enclosure with a s

Question

A long conducting cylindrical rod is inside a long conducting enclosure with a square cross-section as shown below.

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 at V = +4000, +3000, +2000, and +1000 volts.

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.)
TrueFalseNNEESESSWWNWThe y-component of the E-field at 4 is negative.
TrueFalseNNEESESSWWNWThe direction of the force on a small (-) charge at 9 is ....
TrueFalseNNEESESSWWNWThe direction of the force on a small (+) charge at 9 is ....
TrueFalseNNEESESSWWNWThe direction of the E-field at 5 is ....
TrueFalseNNEESESSWWNWThe magnitude of the E-field at 4 is greater than that at 7
TrueFalseNNEESESSWWNWThe y-component of the E-field at 7 is zero.
TrueFalseNNEESESSWWNWThe E-field at 6 is zero

I'm not sure about the 2nd and 3rd ones.

I have these:

False

?

?

SW

False

True

True

Explanation / Answer

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