Question

Two coper a and b having lengths in the ratio of 2:1,area of cross-section in the ratio 1:2 are connected to a battery of potential difference v separately. What is the ratio of current density a to b

Answer 1

As we know ideal gas equation i.e.
PV=nRT
On further arrangement by wrting 
n=Weight/Molar Mass and shifting 'V' to RHS we will get 
P=WRT/VM
P=dRT/M ( AS DENSITY =MASS/VOLUME)
NOW USING THIS FORMULA FOR TWO GASES 
P1/P2 = d1M2T1/d2M1T2
As given data 
d1/d2=1/2 & T1/T2 = 2/1
On solving ,
P1/P2=M2/M1.

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