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 6 8 2 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.) C The y-component of the E-field at 8 is negative. C The magnitude of the E-field at 8 is greater than that at 4 The x-component of the E-field at 3 is zero. The direction of the E-field at 5 is C The magnitude of the E-field at 6 is very small ( zero) C The direction of the force on a small (+) charge at 3 is C The direction of the force on a small (-) charge at 7 is. Submit Answer Tries 0/6

Answer 1

1)

The y-component of electric field at 8 is negative : TRUE

Explanation :

As the electric field at a point is given by the perpendicular direction of the contour, the electric field must be directed in South east direction at 8. Thus the y-component is directed towards south.(-ve direction)

2)

The electric field at 4 is greater than that at 8 as the equipotential lines are far more concentrated at 4 than at 8.

So, answer is : FALSE

3)

If we draw a line perpendicular to the equitorential surface at 3, we can see that the line is vertical . This gives the direction of electric field.

So, the x-component of electric field is 0

So, asnwer is : TRUE

4)

The perpendicular to the equipotential surface at 5 is directed towards North-West.

So, answer is : NW

5)

Electric field is negligible at 6 as the surface is grounded.

So, answer is TRUE

6)

Direction of force = direction of electric field (for +ve charge)

So, answer is : N

7)

Direction of force = N (north)