CAIE A-Level Physics A2 18.2.1 E V D to Calculate the Field Strength of the Uniform Field Between Questions

Calculate uniform field strength with E = ΔV/Δd, rearrange for voltage or separation, and interpret field direction and units.

Exam points

calculate uniform electric field strength between parallel plates using E = ΔV/Δd
rearrange E = ΔV/Δd to determine potential difference or plate separation and use consistent units
interpret the direction and uniform nature of the field between charged plates

[Maximum number: 2]

Fig. 4.1 shows a pair of parallel metal plates with a potential difference (p.d.) of 2400 V between them.

Fig. 4.1

The plates are separated by a distance of 4.6 cm . The plates are in a vacuum.

Calculate the strength of the electric field between the plates.
electric field strength = $\mathrm{NC}^{-1}$

E=V / d
$\text { = } 2400 \text { / } 0.046$ $=5.2 \times 10^{4} \mathrm{~N} \mathrm{C}^{-1}$

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