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प्रश्न
A coil has inductance 2 H. The ratio of its reactance, when it is connected first to an a.c. source and then to d.c. source, is ____________.
पर्याय
zero
infinity
1
less than 1
MCQ
रिकाम्या जागा भरा
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उत्तर
A coil has inductance 2 H. The ratio of its reactance, when it is connected first to an a.c. source and then to d.c. source, is infinity.
Explanation:
`"For" "AC", "X"_"L" = 2pi"fL"`
For DC, f = zero
`therefore ("X"_("L"("AC")))/"X"_("L"("DC")) ="infinity" `
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