5 marksTwo charged metal spheres A and B are situated in a vacuum, as illustrated in Fig. 4.1.
Fig. 4.1
The shortest distance between the surfaces of the spheres is 6.0 cm.
A movable point P lies along the line joining the centres of the two spheres, a distance x from the surface of sphere A.
The variation with distance x of the electric field E at point P is shown in Fig. 4.2.
Fig. 4.2
[2]
Use data from Fig. 4.2 to determine the magnitude of the acceleration of the proton.
acceleration = ................................. m s–2 [3]
2 marksThe electric potential gradient is related to the electric field.
Use data from Fig. 4.2 to state the value of 
at which the magnitude of the electric potential gradient is maximum. Give a reason for the value you have chosen.
Did this page help you?
