A series L.R circuit connected with an ac source … has a power factor of …. If the source of emf is changed to …, the new power factor of the circuit will be :

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Alternating Current

JEE Main 2024 · 30 Jan, Morning shift · Q5927

PhysicsMedium94×since 2002Q5927

A series L.R circuit connected with an ac source

E=(25 \sin 1000 t) V

has a power factor of

\frac{1}{\sqrt{2}}

. If the source of emf is changed to

\mathrm{E}=(20 \sin 2000 \mathrm{t}) \mathrm{V}

, the new power factor of the circuit will be :