Concepts Of Physics MCQ Edition [Volume 2]PhysicsElectric Current in Conductors
An electron gun releases 2.0 10¹⁶ electrons per second. Determine the electric current this corresponds to.
Options
- A3.2 10⁻³ A
- B3.2 A
- C1.6 10⁻³ A
- D3.2 10⁻⁴ A
Correct answer
A. 3.2 10⁻³ A
Step-by-step solution
Electric current is defined as the rate of flow of electric charge. I = q t Since q = ne , where n is the number of electrons and e is the elementary charge, the current can be written as: I = n t e Given the number of electrons released per second is n t = 2.0 10¹⁶ s ⁻¹ and the charge of an electron is e = 1.6 10⁻¹⁹ C . I = (2.0 10¹⁶) (1.6 10⁻¹⁹) A I = 3.2 10⁻³ A