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Fig (a) and (b) show the field lines of ...

Fig (a) and (b) show the field lines of a single positive and negative charges respectively .
Give the sign of the work done by the field in moving a small positive charge from Q to P .

Text Solution

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Work done by the electric field in moving a small +ve charge from Q to P = `q (V_(Q) - V_(P))` , which is obviously negative .
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Knowledge Check

  • The work done by a magnetic field on moving charge is

    A
    zero because `vecF` acts parallel to `vecv.`
    B
    positive because `vecF` acts perpendicular to `vecv`.
    C
    zero because `vecF` acts perpendicular to `vecv`.
    D
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    A
    1
    B
    0
    C
    infinite
    D
    Magnetic field is 'independent of charge

  • Electric field lines abot a negative point charge are

    A
    Circular, anticlockwise
    B
    Circular, clockwise
    C
    Radial, inwards
    D
    Radial , outwards

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