The area of its cross-section is $1.2 \times {10^{ - 3}}{m^2}$. Around its central section, a coil of $300$ turns is wound. If an initial current of $2A$ in the solenoid is reversed in $0.25\, sec$, then the $e.m.f$. induced in the coil is

  • A

    $6 \times {10^{ - 4}}\,V$

  • B

    $4.8 \times {10^{ - 3}}\,V$

  • C

    $6 \times {10^{ - 2}}\,V$

  • D

    $48 \,mV$

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