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In a certain circuit current changes with time according to  i=2t. r.m.s. value of current betweent=2s   to t=4s  will be

a
3A
b
33A
c
23A
d
(2−2)A

detailed solution

Correct option is C

i2¯=∫  i2dt∫  dt=∫24(4t)dt∫24dt=4∫24t dt2==2t2224=t224=12 ⇒irms=i2=12=23A

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