The strength and size of an electric field around a charged object are primarily determined by the object's charge. The magnitude of the electric field (E) created by a point charge can be calculated using Coulomb's law, which states that the electric field is directly proportional to the amount of charge (Q) and inversely proportional to the square of the distance (r) from the charge:
\[ E = \frac{k \cdot |Q|}{r^2} \]
where \(k\) is Coulomb's constant.
The other options listed—weight, mass, and color—do not directly affect the electric field strength around a charged object. Therefore, the correct answer is the object's charge.
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