IB Physics SL D 2 6 Electric Field Strength Questions

Practise IB Physics SL D.2.6 by defining, calculating and interpreting electric field strength around charges and plates.

Exam points

Define electric field strength as force per unit positive charge.
Calculate E = F/q or E = kQ/r² with direction.
Combine electric-field contributions from several charges and plates.

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Study D.2.6—Electric field strength conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

[Maximum number: 4]

This question is in two parts. Part 1 is about simple harmonic motion and forced oscillations. Part 2 is about electric and magnetic force fields.

Part 1 Simple harmonic motion and forced oscillations
The graph shows the variation with time of the displacement of an object undergoing simple harmonic motion.
displacement / mm

Figure for Question IB Physics SL D 2 6 Electric Field Strength Questions question 1 — IB Physics SL

time / ms

(a)

Part 2 Electric and magnetic force fields

[ 4 ]

(i)

Define electric field strength.

[ 2 ]

(ii)

The diagram shows a pair of horizontal metal plates. Electrons can be deflected vertically using an electric field between the plates.

Figure for Question (ii) — IB Physics SL

[ 2 ]

(i)

Calculate the force on an electron between the plates when the electric field strength has a value of $2.5 \times 10^{3} \mathrm{NC}^{-1}$ .

[ 2 ]

$F=2.5 \times 10^{3} \times 1.6 \times 10^{-19}$ ;
$4.0 \times 10^{-16} \mathrm{~N}$ ;

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Award [2] for a bald correct answer.

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IB Physics SL D 2 6 Electric Field Strength Questions question 1

Question (a)

Question (i)

Question (ii)

Question (i)