Question 7
FThe figure shows an isolated metal sphere that carries a positive charge. The sphere is held on an insulating stand. Two points, X and Y, are marked in the space around the sphere. X is closer to the sphere than Y is.
Figure: An isolated positively charged metal sphere on an insulating stand, with two points marked at different distances from its surface
a.[1]
The electric field of the sphere is stronger at one of the two points X and Y. Give the letter of that point.
b.[1]
Give the reason for your answer to part a).
c.[1]
A small negatively charged bead is placed at point Y. The bead is then moved to point X.
Describe what happens to the size of the force on the bead.
d.[2]
Draw two field lines on the figure to show the direction of the electric field around the sphere.