What is the most powerful magnetic field a planet could generate?

What is the most powerful magnetic field that could be generated by a planetary object? The measurement of 'powerful' will be field strength ($\mathbf{B}$-field) at the planet's surface, in teslas.

Restrictions

• The planet may have any composition (gas giant, rocky, methane-ball, exotic)
• The planet must be sub-stellar; that is, too small to start fusion.
• The planet may be at any stage of development
• The planet must generate this magnetic field itself, not induced from a nearby magnetar or something exotic.
• The planet must be able to orbit a Sun-like star.
• The planet must reasonably be able to form naturally

posted about 6 years ago

kingledion‭

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