⚛️ Physics · Current Electricity · NEET & JEE

A copper conductor contains 8.5 × 1028 free electrons per m3. If a current of 1.36 A flows through a cross-sectional area of 1.0 mm2, what is the electron drift speed? Take e = 1.6 × 10-19 C.

Answer: 1.0 10 -4 m s -1.

A 1.0 × 10-4 m s-1
B 1.0 × 10-3 m s-1
C 1.0 × 10-2 m s-1
D 1.0 × 10-1 m s-1

Correct answer: A. 1.0 × 10-4 m s-1

Explanation: Using I = neAvd, vd = I/(neA) = 1.36/[8.5 × 1028 × 1.6 × 10-19 × 10-6] = 1.0 × 10-4 m s-1.

In series, the same current flows through both resistors; in parallel, the current splits between branches and the voltage across each resistor is the same.

Concept context

Ohm's law, resistors, Kirchhoff's laws, Wheatstone bridge, and cells.

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A copper conductor contains 8.5 &times; 10<sup>28</sup> free electrons per m<sup>3</sup>. If a current of 1.36 A flows through a cross-sectional area of 1.0 mm<sup>2</sup>, what is the electron drift speed? Take e = 1.6 &times; 10<sup>-19</sup> C.

Concept context

More Current Electricity questions

A copper conductor contains 8.5 × 10<sup>28</sup> free electrons per m<sup>3</sup>. If a current of 1.36 A flows through a cross-sectional area of 1.0 mm<sup>2</sup>, what is the electron drift speed? Take e = 1.6 × 10<sup>-19</sup> C.