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Assume that each atom of copper contributes one electron. If the current flowing through a copper wire of 1 mm diameter is 1.1 A, the drift velocity of electrons will be (density of Cu=9 g , atomic wt. of Cu=63)

a)

b)

0.5

c)

0.1

d)

0.2



Question ID - 150560 | SaraNextGen Top Answer

Assume that each atom of copper contributes one electron. If the current flowing through a copper wire of 1 mm diameter is 1.1 A, the drift velocity of electrons will be (density of Cu=9 g , atomic wt. of Cu=63)

a)

b)

0.5

c)

0.1

d)

0.2

1 Answer
127 votes
Answer Key / Explanation : (c) -

(c)

When A is area of cross-section of wire, and n be number of free electrons per unit volume, then relation between electric current (i) and drift velocity ( ) is

Number of atoms in 63 g of copper is equal to Avogadro’s number ie,

Volume of 63 g copper

Hence, drift velocity

127 votes


127