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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityMicroscopicMedium2 minQB

PhysicsMediumsingle choice

Passage / Comprehension

A small caterpillar crawls in the direction of electron drift along bare copper wire that carries a current of 2.56 A . It travels with the drift speed of the electron in the wire of uniform cross section area $1 mm^{2}$ . Number of free electrons for copper $= 8 \times 1 0^{22} / cc$ & resistivity of copper $= 1.6 \times 1 0^{- 8} Ω m$ .

If the caterpillar starts from the point of zero potential at $t = 0$ , it reaches a point of $____$ potential after 10 sec.

Options:

Answer:

Solution:

$S = 2 \times 1 0^{- 4} \times 10 = 2 \times 1 0^{- 3}$ m

$E = ρ J = 1.6 \times 1 0^{- 8} \times \frac{2.56}{1 0 ^{- 6}}$ V/m

$v = E s = 82 μ V$

Stream:JEESubject:PhysicsTopic:Current ElectricitySubtopic:Microscopic

⏱ 2mℹ️ Source: QB

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