Which of the following does not match

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Which of the following does not match?

A. Compass ⟺ used for navigation and indicates north-south directions

B. Cyclotron ⟺ measures small magnitude Cyclones

C. Actinometer ⟺ measures the intensity of radiation

D. Electroscope ⟺ detects the presence of electric charge

Answer: Option B

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A. cannot be measured

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A. a-2, b-3, c-1, d-4

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