AAMC FL Practice Exam

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Study for the AAMC FL Exam. Prepare with comprehensive flashcards and multiple-choice questions, each equipped with hints and explanations. Gear up for your medical school entrance exam!

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If a glass rod accumulates a charge of +3.2 × 10^-9 C, how many electrons are removed from it?

1.0 × 10^10 electrons
2.0 × 10^10 electrons
3.2 × 10^10 electrons
1.6 × 10^10 electrons

The correct answer is: 2.0 × 10^10 electrons

When a glass rod accumulates a positive charge, it means that electrons have been removed from it. The charge of a single electron is approximately -1.6 × 10^-19 coulombs. To determine how many electrons were removed to create a total charge of +3.2 × 10^-9 C, we can use the formula: Number of electrons = Total charge / Charge of one electron. Substituting the values gives: Number of electrons = (3.2 × 10^-9 C) / (1.6 × 10^-19 C/electron). When you perform the division, this yields: Number of electrons = 2.0 × 10^10 electrons. This calculation shows that to achieve a positive charge of +3.2 × 10^-9 C, a total of 2.0 × 10^10 electrons must be removed from the glass rod. Thus, this solution aligns with the definition of charge and the relationship between charge and the fundamental charge of an electron, ensuring a clear understanding of how positive and negative charges interact.