Electric and Magnetic Fields · Paper 1 — Free Physics SL Practice Questions

A parallel-plate capacitor has plates separated by $2.0 \times 10^{-3} \text{ m}$ in vacuum. The capacitor is connected to a $12 \text{ V}$ battery. What is the magnitude of the uniform electric field between the plates?

A point charge of $-4.0 \times 10^{-6}\ \text{C}$ is fixed at point R. Point P is $0.30\ \text{m}$ from R. What is the magnitude of the electric field strength at P due to this charge? (Use $k = 8.99 \times 10^{9}\ \text{N m}^{2}\ \text{C}^{-2}$.)