The power factor of an AC circuit having resistance R and inductance L connected in series to an AC source of angular frequency ω is
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(a) zero (b) ωL/R (c) R/√R²+ω²L² (d) R/ωL
A cell of emf E and internal resistance r supplies current for the same time t through external resistance R₁ and R₂ seperately. If the heat developed in both the cases is the same, then […]
As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of doubly ionised Li-atom (Z=3) is
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(a) 1.51 (b) 28.7 (c) 53.9 (d) 122.4
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