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

Question

A Iona conducting cylindrical rod is inside a long conducting enclosure with a square cross-section as shown to the right. The rod is maintained at a potential of +5000 volts with respect to the square which is grounded (V=0). The contour lines are equipotential 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.) The x component of the E-field at 7 is negative. The direction of the E-field at 4 is .... The magnitude of the E-field at 7 is greater than that at 3 The x component of the E-field at 1 is zero. The direction of the force on a small (-) charge at 5 is .... The E-field at 2 is zero. The direction of the force on a small (+) charge at 1 is

Explanation / Answer

Here ,

as the electric field is in the direction of decreasing electric potential

>> True , the x component of E field at 7 Is negative

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as the electric field is in the direction of decreasing electric potential

>>the direction of E fiel at 4 is south east

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False , the magnitude of electric field at 7 is greater than that at 3.

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Trure , the x-component of E field is zero at 1.

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