The primary Bjerknes force on a small bubble in a strong acoustic field in the presence of another bubble is calculated. It is shown that the influence of the bubbles on each other's primary Bjerknes forces is very substantial even if the separation distance between them is large compared with their size. As a result, the peculiarities of the primary forces in strong fields, such as the change of sign with increasing driving pressure amplitude, manifest themselves earlier and more vigorously. The results obtained are of immediate interest for understanding and modeling collective bubble phenomena in strong fields. [References: 5]
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