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Magnetism

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18 Apr 2009 09:56:54 IST

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Find the time required for a 50Hz AC current to become its value from 0 to the rms value.

A) 2.5 ms B) 5 ms C) 10 ms D) 15 ms

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pushkar limaye

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Joined: 4 Jun 2007

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18 Apr 2009 10:26:29 IST

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ans is A as rms value is achieved at phase angle of pi/4...so required time is (pi/4)/(100pi)=2.5 ms

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