What is meant by electric field strength?
A uniform electric field accelerates an electron from point A to point B, as shown in Fig. 3.1. The separation between A and B is $12\,\text{mm}$. The speed of the electron at A is $2.5\,\text{km s}^{-1}$ and at B is $18\,\text{Mm s}^{-1}$. Calculate (i) the acceleration of the electron, (ii) the change in kinetic energy of the electron, (iii) the electric field strength.
Calculate the acceleration of the electron.
Calculate the change in kinetic energy of the electron.
Calculate the electric field strength.
An $\alpha$-particle travels from A to B in the electric field in (b). Describe and explain how the change in the kinetic energy of the $\alpha$-particle compares with that of the electron. Numerical values are not needed.