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CAIE A-Level Physics A2 18.1 Electric Fields and Field Lines Questions

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

18.1.1—An electric field is an example of a field of force and define electric18.1.2—F = qE for the force on a charge in an electric field18.1.3—An electric field by means of field lines

Question 1

[Maximum number: 4]

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

Fig. 5.1

[ 2 ]

Question (i)

(i)

On Fig. 5.1, draw four field lines to represent the electric field between the plates.

[ 2 ]

Question 2

[Maximum number: 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

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 = ms−2\mathrm{ms}^{-2} [2]

Question 3

[Maximum number: 3]

Question (a)

(a)

State what is represented by an electric field line.

[ 2 ]

Question (b)

(b)

Two point charges P and Q are placed 0.120 m apart as shown in Fig. 4.1.

Fig. 4.1

Fig. 4.1

[ 1 ]

Question (i)

(i)

An electron is positioned at point X , equidistant from both P and Q , as shown in Fig. 4.2.

Fig. 4.2

Fig. 4.2

On Fig. 4.2, draw an arrow to represent the direction of the resultant force acting on the electron.

[ 1 ]

Question 4

[Maximum number: 2]

Define electric field.

Question 5

[Maximum number: 2]

State what is represented by an electric field line.

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