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15 February, 16:07

A 0.13 g plastic bead is charged by the addition of 1.0Ã1010 excess electrons. what electric field eâ (strength) will cause the bead to hang suspended in the air?

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  1. 15 February, 19:45
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    The working equation for this is: E = F/Q, where E is the strength of electric field, F is the force and Q is the charge. The force is equal to:

    F = mg = (0.13/1000 kg) (9.81 m/s²) = 1.2753*10⁻³ N

    The charge of he excess electrons is equal to:

    Q = (-1.6021766208*10⁻¹⁹ C/electron) (1*10¹⁰ electrons)

    Q = - 1.6021766208*10⁻⁹ C

    E = 1.2753*10⁻³ N/-1.6021766208*10⁻⁹ C

    E = - 795,979.66 N/C
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