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15 December, 13:46

If an object with charge - 3 nC moves from a location that has a potential of - 20 V to a location with a potential of - 10 V, what has happened to the potential energy of the system?

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  1. 15 December, 13:50
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    The potential energy decreases.

    Explanation:

    Given-

    Charge of the object, q = - 3nC

    Initial potential, Vi = - 20V

    Final potential, Vf = - 10V

    Potential energy, U = ?

    We know,

    Potential, V = U/q

    initial potential energy = Viq

    = - 20V X - 3nC

    = 60 nJ

    Final potential energy = Vfq

    = - 10V X - 3nC

    = 30nJ

    We can see that the potential energy decreases as the object moves from initial to final position which means that the work is done against the electric field.
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