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  • Fig 1.11 shows the electric field lines around three point charges A. B and C. (a) Which charges are positive (b) Which charge has the largest magnitude Why

Fig. 1.11 shows the electric field lines around three-point charges A, B, and C.

(a) Which charges are positive?
(b) Which charge has the largest magnitude? Why?
(c) In which region or regions of the picture could the electric field be zero? Justify your answer.
(i) near A, (ii) near B, (iii) near C, (iv) nowhere.



 

Answers (1)

Explanation:-

a) Field lines protrude outward from positive charges and terminate inward on negative charges. A and C are positive charges as the electric field lines are protruding out of these two charges.

b)  The magnitude of a charge is directly related to the number of electric field lines emanating from or converging on the charge. A larger number of lines indicates a larger magnitude. Charge C has the largest magnitude as it has the greatest number of electric field lines coming out.

c) A neutral point is a point where the electric field is zero, i.e., the electric field vectors from multiple charges cancel each other

  • Neutral points typically occur between two charges of the same sign but different magnitudes. The neutral point is closer to the weaker charge because the stronger charge exerts a greater electric field over longer distances.

The neutral region is in between the charges A and C. Charge C is a stronger charge; therefore the neutral point naturally lies near A (charge A is a weak charge).

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