Magnetic flux linked with a coil of radius 10 Ω is given by ϕ=(20−3t2) weber where t is time in second. Then total charge flown through the coil in the interval from t = 0 to t = 2S is
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a
0.85 coul
b
1.2 coul
c
2.4 coul
d
zero
answer is B.
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Detailed Solution
charge flown Q=ϕi−ϕfRNow ϕi=20 weber and ϕf=(20−3×22) weber∴ Q=20−810coul=1.2 coul