(Figure 1) shows two different ways to visualize an electric field. On the left,

Question

(Figure 1) shows two different ways to visualize an electric field. On the left, vectors are drawn at various points to show the direction and magnitude of the electric field. On the right, electric field lines depict the same situation. Notice that, as stated above, the electric field lines are drawn such that their tangents point in the same direction as the electric field vectors on the left. Because of the nature of electric fields, field lines never cross. Also, the vectors shrink as you move away from the charge, and the electric field lines spread out as you move away from the charge. The spacing between electric field lines indicates the strength of the electric field, just as the length of vectors indicates the strength of the electric field. The greater the spacing between field lines, the weaker the electric field. Although the advantage of field lines over field vectors may not be apparent in the case of a single charge, electric field lines present a much less cluttered and more intuitive picture of more complicated charge arrangements.

Explanation / Answer

Part

A

option (d ) correctly depicts the electric field from infinite plate as lines are coming towards plate on both side

B

first 2 options are answers

lines cannot cross each other

fields lines must be parallel to each other

part C

(B) depicts electric field of dipole

part D

Qa will be positive

Qb will be negative

lines are more dense towards Qa

so magnitude of Qa>Qb

so

Qa=+7q

Qb=-3q

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