Difference in Potential (“electrical level”) between 2 places in an Electric flied, E (unit are volts)

For a point charge of q = +5/9 nC (n = 10-9), ke = 9.0x10 ⁹ Nm ² /C

• Determine the distance, r, at which the potential is 500V, 400V, 300Vm 200V & 100V
• Draw freehand a 2-dimensional potential map showing the five equipotential lines.
• Graph the potential V-versus-x along and x-axis passing through the charge (including both negative a positive value for x0.
• Looking at the slope, determine if E _x points (toward or away from the charge), and how the field strength varies with distance (increases, decreases, or stays the same)
• Draw electric field vectors on the map. Make sure you have the correct direction and the vectors get shorter with weaker fields.
• Estimate (calculate the approximate) field strength E at a point where V = 400V. Use the potential versus position data.
• Finally, calculate the exact field strength for a point charge at that distance and compare.