1.1. An electron and positron are on the same straight line as shown in Fig 1.3. 

Fig 1.3

State the direction of the electric force at points

(i) A

(ii) B

(iii) C

(iv) D.

1.2. Calculate the force on the positron if it was accelerated through an electric field with a strength of 5.6 kV m^–1.

1.3. Fig 1.2 shows the positron near a negatively charged metal plate.

Fig 1.2

Sketch the field lines from the positron.

1.4. The positron is now replaced with a charge of +4e instead as shown in Fig 1.3.

Fig 1.3

Sketch the field lines of the +4e.