- #1
PeachBanana
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Homework Statement
One charged plastic ball is vertically above another in a test tube as shown. The balls are in equilibrium a distance "d" apart. If the mass of the upper ball is reduced by a factor of four, the distance between the balls in the test tube would become :
1) 4d
2) 8d
3) 2d
4) square root of 2d
Homework Equations
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The Attempt at a Solution
How are charge and mass related? That's what I can't understand.