Question

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 ____________.

विकल्प

• zero

• infinity

• 1

• less than 1

Answer 1

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" `