Define the term electric field strength.
As shown in Fig. 6.1, two parallel metal plates in a vacuum are separated by a distance of $15\,\text{mm}$. Applying a potential difference across them produces a uniform electric field between the plates. A particle of mass $1.7 \times 10^{-27}\,\text{kg}$ and charge $+1.6 \times 10^{-19}\,\text{C}$ is initially at rest at point A on one plate. The electric field moves the particle to point B on the other plate. At point B, the particle has kinetic energy $2.4 \times 10^{-16}\,\text{J}$.
Calculate the particle's speed at point B.
State the amount of work done by the electric field in moving the particle from A to B.
Use your answer to part (ii) to find the force on the particle.
Determine the potential difference across the plates.
On Fig. 6.2, sketch a graph to show how the kinetic energy of the particle changes with the distance $x$ from point A along the line AB. Numerical values for the kinetic energy are not required.
Use your answer to (ii) to determine the force on the particle.
Determine the potential difference across the plates.
On Fig. 6.2, sketch a graph to show how the particle's kinetic energy varies with the distance $x$ measured from point A along AB. Numerical values for the kinetic energy are not required.