The electric field in a certain region is acting radially outward and is given by $E =Ar.$ A charge contained in a sphere of radius $'a'$ centred at the origin of the field, will be given by

  • [AIPMT 2015]
  • A

    $4\pi {\varepsilon _0}A{a^2}$

  • B

    $A$${\varepsilon _0}{a^2}$

  • C

    $\;4\pi {\varepsilon _0}A{a^3}$

  • D

    $\;{\varepsilon _0}A{a^2}$

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