Suppose the charge shown in Fig. 21.28a is fixed in position. A small, positivel

Question

Suppose the charge shown in Fig. 21.28a is fixed in position. A small, positively charged particle is then placed at some point in the figure and released. Will the trajectory of the particle follow an electric feld line? Why or why not? Suppose instead that the particle is placed at some point in Fig. 21.28b and released (the positive and negative charges shown in the figure are fixed in position) Will Its trajectory follow an electric field line? Again, why or why not? Explain any differences between your answers for the two different situations. 21.28 Electric field lines for three different charge distributions. In g given field line. (a) A single positive charge (b) Two equal and opposite charges (a Field lines always point... away from (t) charges and toward (charges At each point in sp field vector is tang line pässing throu

Explanation / Answer

we know that the electric field lines are originated from the positive charge and ends at the -ve charge  

so that we can call the +ve charges are sources of the field lines and -ve charges are sinks of field lines

and the field lines are radially out ward for the charge

+ve charge radially out ward and for -ve charge radially in ward  

the field lines are not only straight lines and also curved lines  

the interaction between two fields is nothing but the force between the charges

and electric field due to a point charge at a distance r is  

E = kq/r^2

means as we move away from the charge the field strength decreases so as represented in the fig a

when a positive charge placed near the initial (fixed) charge the interaction is more so the it moves in the directions shown compared with the charge placed farther from the fixed charge

F = k*q1*q2/r^2

fig b

dipole the field lines are curved when ever we want to know the field direction at any point , draw a tanget shows the field direction  

As we are placing a positive charge at different positions with respect to fixed positive charge , the direction of electric field shown towards the -vr charge with different magnitudes depends on the position from the -ve charge (Also)

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