A magnetic needle has a frequency of 20 oscillations per minute in the earth’s horizontal field. when the field of a magnet supports the earths horizontal field, the frequency increases to 30 oscillations per minute. The ratio of the field of the magnet to that of the earth is
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A magnetic needle has a frequency of 20 oscillations per minute in the earth’s horizontal field. when the field of a magnet supports the earths horizontal field, the frequency increases to 30 oscillations per minute. The ratio of the field of the magnet to that of the earth is