State the relation between electric field and potential.
Fig. 1.1 shows the electric field lines around a particle with charge q.
Fig. 1.1
State and explain whether the particle is positively or negatively charged.
Two points, A and B, are located on the same field line, as shown in Fig. 1.2.
Fig. 1.2
State and explain whether the electric potential increases, decreases, or stays the same from A to B.
A stationary proton is placed at point A, which is a distance of 0.1 nm from the particle.
The proton is released and moves to point B, which is a distance of 0.5 nm from the particle.
Show that the potential difference between A and B is about 12 V.
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