The alternating current is given by

${i}=\left\{\sqrt{42} \sin \left(\frac{2 \pi}{{T}} {t}\right)+10\right\} {A}$

The $r.m.s.$ value of this current is ${A}$

  • [JEE MAIN 2021]
  • A

    $11$

  • B

    $13$

  • C

    $9$

  • D

    $15$

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