IB Physics SL D 3 1 Charge in Electric Fields Questions

Calculate electric force and acceleration in electric fields, then predict charged-particle direction, speed and trajectory between plates or around charges.

Exam points

calculate electric field, electric force and charged-particle acceleration using potential difference, separation, charge and mass
determine the direction and changing motion of electrons, protons and other charges in uniform or non-uniform electric fields
interpret charged-particle trajectories between plates or around point charges, including parabolic motion, field gradients, potential-energy change and crossed-field effects

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Two oppositely charged parallel plates are a distance 8.0 cm apart. The potential difference between the plates is 120 V . An alpha particle is placed on the positively charged plate and released from rest. Gravity is ignored.

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Show that the acceleration of the alpha particle is about $7 \times 10^{10} \mathrm{~ms}^{-2}$ .

$\begin{aligned} F=<e E=>3.2 \times 10^{-19} \times 1.5 \times 10^{3} \text { OR } 4.8 \times 10^{-16} \mathrm{~N} a=<\frac{F}{m}=>\frac{4.8 \times 10^{-16}}{4 \times 1.67 \times 10^{-27}} \text { OR } 7.2 \times 10^{10} \mathrm{~ms}^{-2} \quad \end{aligned}$

Allow ECF from a).

Award [1] if they use a charge of e and a mass of 2 u obtaining the right result.

[2]

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IB Physics SL D 3 1 Charge in Electric Fields Questions question 1