Three metal balls have radii R1, R2, R3 such that R1E2>E3 O VyE2>E3 O Vy=V2=V3 and E1V2>V3 and Ez=E2=E3 O Vz>V2>V3 and E,>E2>E3 O Vz>V2>V3 and E,
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