A ring of radius R=61 cm carries a charge of Q=+610 nC uniformly distributed over it.  A point charge q is place at the center of the ring, as shown.  The electric field is equal to zero at the point P which is on the axis of the ring and a distance d=25 cm from its center.  What must be the charge q in nC?

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A: Thank you

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.