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Physics · UNITS AND MEASUREMENT
हिन्दीIn the revised SI system (2018), the base unit 'ampere' is defined by fixing the numerical value of elementary charge \( e \) to be \( 1.602176634 \times 10^{-19} \) when expressed in C (or A s). If a current of \( 1.6\text{ A} \) flows through a conductor for \( 10\text{ seconds} \), the total number of electrons passing through any cross-section is closest to:
Correct answer · Option 2
\( 1 \times 10^{20} \)
Explanation
Total charge \( Q = I \times t = 1.6\text{ A} \times 10\text{ s} = 16\text{ C} \). Number of electrons \( N = \frac{Q}{e} = \frac{16}{1.6 \times 10^{-19}} = 10^{20} \).
