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![[Post New]](/templates/default/images/icon_minipost_new.gif) 11 Nov 2007 18:31:23 IST
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a source of emf 10V having negligeble internal resistance is connected to a resistor,the resistance of which varies at a uniform rat of 1 ohm/sec.if the resistance varies from 20ohm to 40ohm in 20sec,then the total charge flown in this time interval is?
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science-
the most fundamental
the most eternal
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11 Nov 2007 21:06:52 IST
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Resistance at time 't' is given as
R=R1 + xt { R1=20 ohms, x rate of change of resistance=1}
R=R1 + t
V=iR
V/R= dq/dt
dq/dt= V/R1+t
[0 ] [q ] dq = V[0 ][20 ] dt/R1+t
q = V{ln(R1+20/R1)
q= 10 ln(40/20)
q=10ln2
rate me if correct:)
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11 Nov 2007 21:25:23 IST
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nice going !
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