JEE Main 2022 Physics question
A compass needle of oscillation magnetometer oscillates 20 times per minute at a place P of dip 30°. The number of oscillations per minute become 10 at another place Q of 60° dip. The ratio of the total magnetic field at the two places : is-
Answer: (1)
Solution
The horizontal component of the field is B , and the time period is . So / = ${ δ _{Q}/
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