electric fields

interacting electric fields

When charged particles are close enough to exert force on each other, their electric fields interact. This is illustrated in the Figure 1.2. The lines of force bend together when particles with different charges attract each other. The lines bend apart when particles with like charges repel each other. Q: What would the lines of force look like around two negative particles? A: They would look like the lines around two positive particles, except the arrows would point toward, rather than away from, the negative particles.

textbook_image

textbook_image

what is an electric field

An electric field is a space around a charged particle where the particle exerts electric force on other charged particles. Because of their force fields, charged particles can exert force on each other without actually touching. Electric fields are generally represented by arrows, as you can see in the Figure 1.1. The arrows show the direction of electric force around a positive particle and a negative particle.

instructional diagrams

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questions

charged particles can exert force on each other only when they are actually touching.

a. true

-->  b. false

electric field lines around a positively charged particle show that force is directed

-->  a) away from the particle.

b) toward the particle.

c) in a circle around the particle.

d) none of the above

electric field lines around a negatively charged particle show that force is directed

a) away from the particle.

-->  b) toward the particle.

c) in a circle around the particle.

d) none of the above

when charged particles are close enough to exert force on each other, their electric fields interact.

-->  a. true

b. false

when oppositely charged particles exert force on each other, their lines of force

-->  a) bend toward each other.

b) push apart from each other.

c) cancel each other out.

d) form longitudinal waves.

when particles with the same charge exert force on each other, their lines of force

a) wrap around each other.

-->  b) bend away from each other.

c) reinforce each other.

d) form surface waves.

diagram questions

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