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The current in a wire varies with time according to the equation l=4+2t, where l is in ampere and t is in sec. the quantity of charge which has passed through a cross-section of the wire during the time t=2 sec to t=6 sec will beA. 60 coulombB. 24 coulombC. 48 coulombD. 30 coulomb |
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Answer» Correct Answer - C Let dq be the charge which ahs passed in a small interval of time dt, then dq=idt=(4+2t)dt. Hence total charge passed between interval t=2 sec and t=6 sec `q=underset(2)overset(6)int(4+2t)dt=48` coulomb. |
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