CAIE A-Level Physics 18.1 Electric Fields and Field Lines
Practise defining electric field strength, applying F = qE to charges and interpreting field-line direction, spacing and strength.
- Syllabus
- 2028–2030
- Course
- Physics 9702
- Level
- A2
Exam points
- define and calculate electric field strength and force on charges using F=qE
- represent and interpret electric field lines, direction and strength
Covered syllabus points
18.1 Electric fields and field lines question 1
Question (a)
(a)
Define electric field.
[ 2 ]
Question (b)
(b)
Fig. 5.1 shows two parallel conducting plates that are in a vacuum. The plates are separated by a distance of 6.7 cm and have a potential difference (p.d.) of 430 V between them.
Fig. 5.1
[ 2 ]
Question (i)
(i)
On Fig. 5.1, draw four field lines to represent the electric field between the plates.
[ 2 ]
18.1 Electric fields and field lines question 2
Two parallel metal plates X and Y are separated by a distance of 0.041 m , as shown in Fig. 6.1.
Fig. 6.1
There is a vacuum between the plates. An electron is at rest at the centre of plate X.
A potential difference (p.d.) of 58 kV is applied across the plates. This causes the electron to accelerate towards plate Y.
Determine the acceleration of the electron.
acceleration = [2]
18.1 Electric fields and field lines question 3
Question (a)
(a)
Define electric field at a point.
[ 1 ]
Question (b)
(b)
An isolated conducting sphere in a vacuum has a capacitance of 69 pF . The charge on the sphere is +83 pC .
[ 2 ]
Question (i)
(i)
On Fig. 6.1, draw field lines to represent the electric field outside the sphere due to the charge on the sphere.
Fig. 6.1
[ 2 ]
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