Answer:
q = 42.3 x 10⁻³ C = 42.3 mC
Explanation:
in order for the Sulphur charge to float the weight of the charge must be equal to the electric force:
[tex]Electric\ Force = Weight\ of \ Sulphur\ Charge\\\\Eq = W\\\\q = \frac{W}{E}[/tex]
where,
q = charge required = ?
W = Weight = 7.4 N
E = Electric Field Strength = 175 N/C
Therefore,
[tex]q = \frac{7.4\ N}{175\ N/C}[/tex]
q = 42.3 x 10⁻³ C = 42.3 mC
