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In the series a.c circuit shown above, the p.d across the inductor is 8Vr.m.s and...

Physics
JAMB 1999
In the series a.c circuit shown above, the p.d across the inductor is 8Vr.m.s and that across the resistor is 6Vr.m.s. The effective voltage is
  • A. 2V
  • B. 10V
  • C. 14V
  • D. 48V
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Correct Answer: Option B
Explanation
The effective V =
√ VR2 + VL2 

=
√ 62 + 82 

=
√ 36 + 64 

=
√ 100 

10V
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