A disk loaded with 8 nC moves on an insulating plane under the action of an electric field created by another charged bu

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A disk loaded with 8 nC moves on an insulating plane under the action of an electric field created by another charged bu

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A disk loaded with 8 nC moves on an insulating plane under the
action of an electric field created by another charged but fixed
disk, initially placed at a distance of 32 cm from the first.
Knowing that the movable disk after traveling 18 cm, moving away at
50 cm, acquires a kinetic energy of 16 mj, find what the charge on
the fixed disk is worth.
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