1
2 marks
2 marksState Coulomb’s law.
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Syllabus Edition
First teaching 2020
Last exams 2024
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18.1 Electric Fields
2a2 marks
2 marksState what is represented by an electric field line.
2b3 marks
3 marksTwo point charges A and B are placed 0.014 mm apart as shown in Fig. 1.1.
Fig. 1.1
The charge of A is +3.1 nC and the charge of B is −6.2 nC. The charges have the following radii:
rA = 3.2 pm
rB = 4.1 pm
Determine the magnitude of the force between the two charges.
2c2 marks
2 marksThe magnitude of the electric forces between the charges is very high.
State and explain why this is the case.
2d5 marks
5 marks(i)
Draw arrows on Fig. 1.1 to show the direction of the electrostatic force coming from charges A and B.
[2]
(ii)
Particle B is replaced by particle C. Particle C has a charge of +6.2 nC.
Describe how the electrostatic force between charges A and C will be different to that between A and B.
[2]
(iii)
A positron is placed at point Y, equidistant from both A and B, as shown in Fig. 1.2.
Fig. 1.2
On Fig. 1.2 draw an arrow representing the direction of the resultant force acting on the positron.
[1]
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3a2 marks
2 marksState what is indicated by the direction of the electric field line.
3b3 marks
3 marksFig. 1.1 shows a pair of parallel metal plates with a potential difference (p.d.) of 3500 V between them.
Fig. 1.1
The plates are separated by a distance of 4.6 cm. The plates are in a vacuum.
On Fig. 1.1, draw five lines to represent the electric field in the region between the plates.
3c2 marks
2 marksCalculate the strength of the electric field between the plates.
electric field strength = .................................... N C−1
3d2 marks
2 marksA moving electron eneters the region between the plates from the left, as shown in Fig. 1.2.
Fig. 1.2
The electron is deflected by the electric field.
On Fig. 1.2, draw a line to show the path of the electron as it moves through and out of the region of the electric field.
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