MCQ
The value of alternating emf $E$ in the given circuit will be......$V$
- A$220$
- B$140$
- ✓$100$
- D$20$
✓
Answer
Correct option: C.
$100$
c
$\mathrm{E}=\sqrt{\mathrm{V}_{\mathrm{R}}^{2}+\left(\mathrm{V}_{\mathrm{L}}-\mathrm{V}_{\mathrm{C}}\right)^{2}}$
$\mathrm{E}=\sqrt{\mathrm{V}_{\mathrm{R}}^{2}+\left(\mathrm{V}_{\mathrm{L}}-\mathrm{V}_{\mathrm{C}}\right)^{2}}$
$=\sqrt{(80)^{2}+(40-100)^{2}}$
$=\sqrt{6400+3600}=\sqrt{10000}$
$=100 \mathrm{\,V}$
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