Question

An electron gun emits $4\times {10}^{16}$ electrons per second. To what value of electric current does this correspond?

• A. 6.4 mA
• B. 3.2 mA
• C. 1.6 mA
• D. 4.8 mA

Answer 1

The correct option is A 6.4 mA

Charge on an electron = $(1.6\times {10}^{-19}C)$
Charge carried by $4\times {10}^{16}$ electrons $=(4\times {10}^{16})\times (1.6\times {10}^{-19}C)$
corresponding current value $=6.4\times {10}^{-3}A$ = 6.4mA