An electric current of 1 A is passing through a cross section of the coil in 1 second. How many electrons are involved in providing a current of 1A? The charge on 1 electron is 1.602x10 - 19 C.
Correct answer: D. 6.42 × 10^18
- A. 3.21 × 10^18
- B. 2.2 × 10^16
- C. 1.602 × 10^19
- D. 6.42 × 10^18
Explanation
To find the number of electrons involved in a current of 1 A, we use the formula:I = n × ewhere I is the current (1 A), n is the number of electrons, and e is the charge of an electron (1.602 × 10^-19 C).The number of electrons, n, can be calculated as:n = I / e = 1 / 1.602 × 10^-19This calculation gives approximately 6.25 × 10^18, usually approximated to 6.42 × 10^18 in standard options.Other options either miscalculate this division or misuse the given data.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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