Example sentences of "vary [prep] a [noun sg] [prep] time " in BNC.

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1 Up to now all the wires have been stationary , and the magnetic field has varied as a function of time .
2 This behaviour is a consequence of the structure of the model and of the fact that the model processes inputs and generates outputs that vary as a function of time .
3 It means that neither the magnitude nor the position of the charge varies as a function of time .
4 This is valid for the case when the flux linking a stationary circuit varies as a function of time .
5 STATIC means not varying as a function of time .
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