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Fig shows the electric field lines arou...

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

Text Solution

Verified by Experts

(a) In fig, the electric lines of force emanate from A and C. Therefore charges A and C must be positive.
(b) As maximum number of electric lines of force are associated with charge C, it must have the largest magnitude.
(c ) There cannot be a neutral point between a positive and a negative charge. Neutral point can be there only between two like charges, ie., A and C. As magnitude of charge A is smallest than teh magnitude of charge C, therefore neutral point would lie closer to charge A.
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Knowledge Check

  • Figure shows the electric field lines around three point charges A, B and C . Which of the following charges are positive?

    A
    only A
    B
    Only C
    C
    Both A and C
    D
    Both B and C

  • At which point (or points) in the given figure is the electric field zero N/C for the two point charges shown on the x axis ?

    A
    The electric field is never zero in the vicinity of these charges.
    B
    The electric field is zero somewhere on the x axis to the left of the +4q charge.
    C
    The electric field is zero somewhere on the x axis to the right of the -2q charge.
    D
    The electric field is zero somewhere on the x axis between the two charges, but this point is nearer to the -2q charge.

  • In the electric field of a point chargde q , a cetrain charge is carried from point A to B, C, D and E . Then the ork done

    A
    is least along the path `AB`
    B
    is least along the path `AD`
    C
    is zero along all the paths `AB, AC, AD and AE`
    D
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