IB Physics HL D 2 6 Electric Field Strength Questions

Practise IB Physics HL D.2.6 by solving electric-field magnitude, vector direction, particle motion and multi-charge superposition problems.

Exam points

Define electric field strength as force per unit positive test charge.
Calculate electric field strength from charge, distance or force using E=F/q and point-charge relationships.
Determine the magnitude and direction of resultant electric fields by superposition.
Relate electric field strength to the force and acceleration of a charged particle.

[Maximum number: 4]

This question is in two parts. Part 1 is about photoelectricity. Part 2 is about electrical and magnetic force fields.
Part 1 Photoelectricity

(a)

Define electric field strength.

[ 2 ]

(b)

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

[ 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 ]

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

Marking guidance:

Award [2] for a bald correct answer.

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