For ultrasonic wave generation, on application of external magnetic field, the

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Option D: length of the rod changes

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Practice and solve "For ultrasonic wave generation, on application of external magnetic field, the..." for Electrical - Electrical Materials. The correct answer is Option D: length of the rod changes. Detailed step-by-step solution, conceptual clarity, and formulas on Examoogle.

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Option A: natural frequency of the rod changes

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Option B: applied frequency of the rod changes

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Option C: cross-sectional area of the rod changes

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