Teaching Haryana (HPSC) Assistant Professor Mock Test 2025 Physics Current, Resistance and Electricity Work, Energy, and EMF
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 E = (20 sin 2000 t) V, the new power factor of the circuit will be:
1
\(\frac{1}{\sqrt{2}}\)
2
\(\frac{1}{\sqrt{3}}\)
3
\(\frac{1}{\sqrt{5}}\)
4
\(\frac{1}{\sqrt{7}}\)
5
Question Not Attempted