,
, . |

Now if α, β, γ be the components of the magnetic induction at the point (*x, y, z*),

,
, . |

Hence we see, by symmetry, that if the sphere move with velocity *q* parallel to the axis of *y*, the corresponding values would be

,
, ; |

and if it moved with velocity *r* parallel to the axis of *z*, the corresponding values would be

,
, . |

Hence, if *p, q, r* be the components of the velocity of the centre of the sphere parallel to the axes of *x, y, z* respectively, the components of magnetic induction are

,
, ; |