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7.Alternating Current
easy
The adjoining figure shows an $AC$ circuit with resistance $R$, inductance $L$ and source voltage $V_s$. Then
A
the source voltage $V_s = 72.8\, V$
B
the phase angle between current and source voltage is $\tan^{-1} \,(7/2)$
C
Both $(A)$ and $(B)$ are correct
D
Both $(A)$ and $(B)$ are wrong
Solution
$\mathrm{V}_{\mathrm{s}}=\sqrt{\mathrm{V}_{\mathrm{R}}^{2}+\mathrm{V}_{\mathrm{L}}^{2}}$
$\mathrm{V}_{\mathrm{s}}=\sqrt{(70)^{2}+(20)^{2}} \mathrm{V}_{\mathrm{s}}=\sqrt{5300}$
$\mathrm{V}_{\mathrm{s}}=72.8 \mathrm{\,V}$
Standard 12
Physics
