KCET2007PhysicsCurrent Electricity
A current of 5 ~A is passing through a metallic wire of cross-sectional area 4 10⁻⁶ ~m ² If the density of charge carriers of the wire is 5 10²⁶ ~m ⁻³ the drift velocity of the electronswill be
Options
- A1 10² ~ms ⁻¹
- B1.56 10⁻² ~ms ⁻¹
- C1.56 10⁻³ ~ms ⁻¹
- D1 10⁻² ~ms ⁻¹
Correct answer
B. 1.56 10⁻² ~ms ⁻¹
Step-by-step solution
Drift velocity, v_ d = 1 n e A aligned v_ d &= 5 (5 10²⁶ ) (1.6 10⁻¹⁹ ) (4 10⁻⁶ ) &= 1 64 =1.56 10⁻² ~ms ⁻¹ aligned