If you mean gravitational force, then it is GMm/r^2, which is G(68)(.91)/ (the distance between you and the laptop), where G is the universal gravitational constant
Answer:
Explanation:
Field by negative charge will be more as net force due to both the charges is in positive y - direction.
field by negative charge at origin
= 9 x 10⁹ x 34 x 10⁻⁶ / .18²
= 9.45 x 10⁶ N /C
field by positive charge at origin
= 9 x 10⁹ x Q / .33²
= 82644.63 x 10⁶ Q N /C
Net field
= 9.45 x 10⁶ - 82644.63 x 10⁶ Q
force on charge 8.1 x 10⁻⁶ C
( 9.45 x 10⁶ - 82644.63 x 10⁶ Q ) X 8.1 x 10⁻⁶ = 31
76.545 - 669421.5 Q = 31
669421.5 Q = 45.545
Q = 45.545 / 669421.5
= 68 X 10⁻⁶ C
= 68 μC
Answer: A (smooth)
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