Uniform electric fields
18.2What the syllabus asks of you
- recall and use E = ∆V / ∆d to calculate the field strength of the uniform field between charged parallel plates
- describe the effect of a uniform electric field on the motion of charged particles
Read the notes first
Chapter 18: Uniform electric fields
Drill this topic
Every question on Uniform electric fields, untimed, marked as you go.
Make a worksheet
Choose the years and how many questions, then print it with the answers on separate pages.
56 questions
1Oct / Nov 2021 · Paper 11 · Q31Show mark scheme →
A0.75
B1.00
C1.25
D1.50
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2Oct / Nov 2021 · Paper 12 · Q32Show mark scheme →
AIt begins to move downwards.
BIt begins to move upwards.
CIts speed decreases.
DIts speed increases.
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3Oct / Nov 2021 · Paper 13 · Q31Show mark scheme →
ADiagram A
BDiagram B
CDiagram C
DDiagram D
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4Oct / Nov 2021 · Paper 13 · Q32Show mark scheme →
A8.5 × 10–9 m s–2
B1.6 × 10–5 m s–2
C1.4 × 1011 m s–2
D2.6 × 1014 m s–2
Mark scheme
5May / June 2021 · Paper 11 · Q11Show mark scheme →
Aboth electric and gravitational
Belectric only
Cgravitational only
Dneither electric nor gravitational
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6May / June 2021 · Paper 11 · Q31Show mark scheme →
AIt is stationary.
BIt has a downward acceleration of 9.7 m s⁻².
CIt has an upward acceleration of 1.3 m s⁻².
DIt has an upward acceleration of 11 m s⁻².
Mark scheme
7May / June 2021 · Paper 12 · Q30Show mark scheme →
AMoving P a small distance in any direction will not change the electric force on P.
BMoving P a small distance in direction Y will increase the electric force on P.
CMoving P a small distance in direction Z will increase the electric force on P.
DMoving P a small distance in direction X will increase the electric force on P.
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8May / June 2021 · Paper 12 · Q31Show mark scheme →
A1.4 × 10² N C⁻¹ from P towards Q
B1.4 × 10² N C⁻¹ from Q towards P
C1.4 × 10⁵ N C⁻¹ from P towards Q
D1.4 × 10⁵ N C⁻¹ from Q towards P
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9May / June 2021 · Paper 13 · Q32Show mark scheme →
Aa small increase in the distance between the plates
Ba small increase in the potential difference between the plates
Ca small increase in the resistance of the resistor
Da small increase to the area of both plates
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10Feb / March 2021 · Paper 12 · Q11Show mark scheme →
Adownwards, negative
Bdownwards, positive
Cupwards, negative
Dupwards, no charge
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11Feb / March 2021 · Paper 12 · Q31Show mark scheme →
A1.6 × 10⁻⁶ N
B8.0 × 10⁻⁴ N
C1.6 × 10⁻³ N
D0.40 N
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12Oct / Nov 2020 · Paper 11 · Q31Show mark scheme →
Agd/V
BV/(dg)
CgV/d
Dd/(Vg)
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13Oct / Nov 2020 · Paper 12 · Q31Show mark scheme →
Ahorizontal component of velocity: constant; vertical component of velocity: increases
Bhorizontal component of velocity: constant; vertical component of velocity: zero
Chorizontal component of velocity: increases; vertical component of velocity: increases
Dhorizontal component of velocity: increases; vertical component of velocity: zero
Mark scheme
14Oct / Nov 2020 · Paper 12 · Q32Show mark scheme →
Aelectric field strength between the plates: decreases; potential difference between the plates: constant
Belectric field strength between the plates: increases; potential difference between the plates: constant
Celectric field strength between the plates: decreases; potential difference between the plates: increases
Delectric field strength between the plates: increases; potential difference between the plates: increases
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15Oct / Nov 2020 · Paper 13 · Q32Show mark scheme →
Adownwards, decrease
Bdownwards, increase
Cupwards, decrease
Dupwards, increase
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16May / June 2020 · Paper 11 · Q32Show mark scheme →
A+1.6 × 10^–19 C
B–1.6 × 10^–19 C
C+1.6 × 10^–17 C
D–1.6 × 10^–17 C
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17May / June 2020 · Paper 12 · Q32Show mark scheme →
Amax/V
B2max/V
C3max/V
D4max/V
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18May / June 2020 · Paper 13 · Q32Show mark scheme →
A\frac{mdg}{V_1 - V_2}
B\frac{mdg}{V_1 + V_2}
C\frac{2mdg}{V_1 - V_2}
D\frac{2mdg}{V_1 + V_2}
Mark scheme
19Feb / March 2020 · Paper 12 · Q31Show mark scheme →
Adecreasing the distance between the plates whilst keeping the drop equidistant from them
Bincreasing the amount of negative charge on the drop
Cincreasing the supply voltage
Dmoving the drop closer to the positive plate
Mark scheme
20Oct / Nov 2019 · Paper 12 · Q30Show mark scheme →
A\frac{mgd}{eV}
B\frac{eV}{mgd}
C\frac{meV}{gd}
D\frac{gd}{meV}
Mark scheme
21Oct / Nov 2019 · Paper 13 · Q32Show mark scheme →
AThe acceleration of the particle between P and Q is increasing.
BThe kinetic energy of the particle at P is the same as the kinetic energy of the particle at Q.
CThe force on the particle at Q is greater than the force on the particle at P.
DWork is done on the particle as it moves from P to Q.
Mark scheme
22May / June 2019 · Paper 11 · Q8Show mark scheme →
A3.1 × 10⁻⁵ J
B2.0 × 10⁻³ J
C3.1 × 10⁻² J
D2.0 J
Mark scheme
23May / June 2019 · Paper 12 · Q13Show mark scheme →
AP to R; Q to S
BP to R; P to S
CS to Q; S to R
DS to Q; R to P
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24May / June 2019 · Paper 12 · Q32Show mark scheme →
AIt moves downwards with a constant acceleration.
BIt moves downwards with zero acceleration.
CIt moves upwards with a constant acceleration.
DIt moves upwards with a decreasing acceleration.
Mark scheme
25May / June 2019 · Paper 13 · Q10Show mark scheme →
AThe electric field makes the particle move towards the negative plate with a constant speed.
BThe electric field makes the particle move towards the negative plate with a constant acceleration.
CThe electric field produces a uniform rate of decrease in the particle's acceleration.
DThe electric field produces a uniform rate of increase in the particle's acceleration.
Mark scheme
26Feb / March 2019 · Paper 12 · Q30Show mark scheme →
A1.0 × 10⁴ V m⁻¹ downwards
B1.0 × 10⁴ V m⁻¹ upwards
C2.0 × 10⁴ V m⁻¹ downwards
D2.0 × 10⁴ V m⁻¹ upwards
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27Oct / Nov 2018 · Paper 11 · Q31Show mark scheme →
AA
BB
CC
DD
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28Oct / Nov 2018 · Paper 11 · Q32Show mark scheme →
A\frac{qV}{md}
B\frac{qd}{mV}
C\frac{mV}{qd}
D\frac{md}{qV}
Mark scheme
29Oct / Nov 2018 · Paper 12 · Q11Show mark scheme →
Aarrow pointing down and arrow pointing down-right
Barrow pointing down and arrow pointing right
Carrow pointing down-right
Darrow pointing down
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30Oct / Nov 2018 · Paper 12 · Q32Show mark scheme →
AGraph A: E decreasing from a maximum at t = 0, curve concave downward
BGraph B: E decreasing from a maximum at t = 0, curve concave upward
CGraph C: E increasing from zero at t = 0, curve concave downward
DGraph D: E increasing from a non-zero value at t = 0, curve concave upward
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31Oct / Nov 2018 · Paper 13 · Q30Show mark scheme →
ADiagram A: field lines pointing left (from +1300 V to +800 V), bulging outward at the edges
BDiagram B: field lines pointing left (from +1300 V to +800 V), bulging outward at the edges
CDiagram C: field lines pointing right (from +800 V to +1300 V), bulging outward at the edges
DDiagram D: field lines pointing right (from +800 V to +1300 V), bulging outward at the edges
Mark scheme
32Oct / Nov 2018 · Paper 13 · Q31Show mark scheme →
A1.4 × 10² N C⁻¹ from P towards Q
B1.4 × 10² N C⁻¹ from Q towards P
C1.4 × 10⁵ N C⁻¹ from P towards Q
D1.4 × 10⁵ N C⁻¹ from Q towards P
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33May / June 2018 · Paper 11 · Q29Show mark scheme →
AF/4
BF/2
CF
D2F
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34May / June 2018 · Paper 12 · Q30Show mark scheme →
AIt decreases because the positively charged particle is moving away from the positively charged plate.
BIt decreases because the positively charged particle is moving in the direction of the electric field between the plates.
CIt increases because the positively charged particle is moving closer to a negatively charged plate.
DIt remains constant because the positively charged particle is in the uniform electric field between the plates.
Mark scheme
35May / June 2018 · Paper 13 · Q27Show mark scheme →
A2.4 × 10^11 m s^–2 downwards
B2.4 × 10^11 m s^–2 upwards
C5.3 × 10^11 m s^–2 downwards
D5.3 × 10^11 m s^–2 upwards
Mark scheme
36May / June 2018 · Paper 13 · Q28Show mark scheme →
Ad/4
Bd/2
C2d
D4d
Mark scheme
37Feb / March 2018 · Paper 12 · Q12Show mark scheme →
Aboth electric and gravitational
Belectric only
Cgravitational only
Dneither electric nor gravitational
Mark scheme
38Feb / March 2018 · Paper 12 · Q30Show mark scheme →
A1.6 × 10–15 N
B4.8 × 10–15 N
C6.4 × 10–15 N
D8.0 × 10–15 N
Mark scheme
39Feb / March 2018 · Paper 12 · Q31Show mark scheme →
AElectric charges of the same magnitude, whether positive or negative, experience the same magnitude of force when placed in the same uniform electric field.
BThe direction of the force on a positive charge placed in a uniform electric field is independent of the magnitude of the charge.
CThe magnitude of the force on a positive charge placed in a uniform electric field is proportional to the magnitude of the electric field strength.
DThe work done to move a positive charge a certain distance in a uniform electric field is independent of the direction of the movement.
Mark scheme
40Oct / Nov 2017 · Paper 11 · Q31Show mark scheme →
A–5.9 µC
B+0.60 µC
C+5.9 µC
D+9.8 µC
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41Oct / Nov 2017 · Paper 11 · Q32Show mark scheme →
Acurved, decreases
Bcurved, increases
Clinear, decreases
Dlinear, increases
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42Oct / Nov 2017 · Paper 12 · Q31Show mark scheme →
AGraph A: E decreases as d increases (inverse curve)
BGraph B: E constant as d increases
CGraph C: E increases as d increases (upward curve)
DGraph D: E decreases linearly as d increases
Mark scheme
43Oct / Nov 2017 · Paper 12 · Q32Show mark scheme →
A– 4 eV
B–2 eV
C+2 eV
D+4 eV
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44Oct / Nov 2017 · Paper 13 · Q32Show mark scheme →
A12.5 MV
B25 MV
C50 MV
D100 MV
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45May / June 2017 · Paper 12 · Q31Show mark scheme →
Ax
B\sqrt{2}x
C2x
D4x
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46May / June 2017 · Paper 13 · Q30Show mark scheme →
AAll charged particles experience the same force.
BAll charged particles move with the same velocity.
CAll electric field lines are directed towards positive charges.
DAll electric field lines are parallel.
Mark scheme
47Feb / March 2017 · Paper 12 · Q31Show mark scheme →
Adirection of acceleration: downwards; separation of the plates: decrease
Bdirection of acceleration: downwards; separation of the plates: increase
Cdirection of acceleration: upwards; separation of the plates: decrease
Ddirection of acceleration: upwards; separation of the plates: increase
Mark scheme
48Oct / Nov 2016 · Paper 11 · Q30Show mark scheme →
AA
BB
CC
DD
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49Oct / Nov 2016 · Paper 11 · Q32Show mark scheme →
A–320 V
B–160 V
C+160 V
D+320 V
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50Oct / Nov 2016 · Paper 12 · Q30Show mark scheme →
A50 N C^–1
B100 N C^–1
C150 N C^–1
D300 N C^–1
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51Oct / Nov 2016 · Paper 12 · Q31Show mark scheme →
Agd/V
BV/(dg)
CgV/d
Dd/(Vg)
Mark scheme
52Oct / Nov 2016 · Paper 13 · Q30Show mark scheme →
AA
BB
CC
DD
Mark scheme
53Oct / Nov 2016 · Paper 13 · Q32Show mark scheme →
A–320 V
B–160 V
C+160 V
D+320 V
Mark scheme
54May / June 2016 · Paper 11 · Q28Show mark scheme →
Aacceleration
Bdisplacement
Crate of change of acceleration
Dvelocity
Mark scheme
55May / June 2016 · Paper 12 · Q31Show mark scheme →
AX 300, Y 600, Z 900
BX 1100, Y 1400, Z 1700
CX 3.0 × 10⁴, Y 3.0 × 10⁴, Z 3.0 × 10⁴
DX 5.0 × 10⁴, Y 5.0 × 10⁴, Z 5.0 × 10⁴
Mark scheme
56Feb / March 2016 · Paper 12 · Q29Show mark scheme →
A6.4 × 10^–15 N
B6.4 × 10^–18 N
C1.6 × 10^–19 N
D4.0 × 10^–24 N
Mark scheme