Some equipotential surfaces of the magnetic scalar potential are shown in the figure. Magnetic field at a point in the region is

138-9

  • A

    ${10^{ - 4}}\,T$

  • B

    $2 \times {10^{ - 4}}\,T$

  • C

    $0.5 \times {10^{ - 4}}\,T$

  • D

    None of these

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