Final answer:
To calculate the number of electrons passing a point in a wire, use the formula: No. of electrons = (current x time) / (charge of an electron). Given the current of 12 mA for 25 s, the number of electrons passing the point in 1 min is approximately 1.875 x 10^19 electrons.
Step-by-step explanation:
The number of electrons passing a point in a wire can be calculated using the formula:
No. of electrons = (current x time) / (charge of an electron)
Given that the current is 12 mA and the time is 25 s, we can substitute these values into the formula:
No. of electrons = (12 mA x 25 s) / (1.6 x 10^-19 C)
Simplifying the calculation, we find that the number of electrons passing the point in the wire in 1 min is approximately 1.875 x 10^19 electrons.