If the emf of an $AC$ source is given by $E = 6 \sin \omega t + 4 \sin 2 \omega t \text{ V}$,then the rms value of the emf is

  • A
    $\sqrt{10} \text{ V}$
  • B
    $\sqrt{26} \text{ V}$
  • C
    $\sqrt{32} \text{ V}$
  • D
    $\sqrt{20} \text{ V}$

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