Question

.If n electrons pass through a cross section of a conductor in time t, then

the current in conductor is

a. Q = n/e

b. Q = ne

c. Q = e/n

d. Q = e + n​

Answer 1



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12th

Physics

Current Electricity

Electric Current

If 'n' electrons flow throu...

PHYSICS

 If 'n' electrons flow through a cross-section of a conductor in time t and charge on an electron is 'e', then the current in the conductor would be :

A .

tne

B .

tne2

C .

te

D .

etn

December 20, 2019Drishti Parveen

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ANSWER

Consider a conductor of length of L and cross sectional area A. 

When an electric field E is applied across it, the electrons are drifted opposite to the applied field. 

Volume of a conductor =LA=1 in this case. 

Let n be the number of free electrons per unit volume of conductor.

Total charge on all the electrons in the conductor =nLAe 

where, e is the charge of each electron.

⇒q=nLAe=neAL 

But current, I=tq=tneAL=tneasAL=1