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A compass needle oscillates 20 times per...

A compass needle oscillates 20 times per minute at a place where the dip is `45^@` and 30 times per minute where the dip is `30^@`. Compare the total magnetic field due to the earth at the two places.

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To solve the problem of comparing the total magnetic field due to the Earth at two different places based on the oscillation of a compass needle, we can follow these steps: ### Step 1: Understand the Given Data - At the first location (Dip = 45°), the compass needle oscillates 20 times per minute. - At the second location (Dip = 30°), the compass needle oscillates 30 times per minute. ### Step 2: Convert Oscillations to Periods The period \( T \) of oscillation is the reciprocal of the frequency (number of oscillations per minute). ...
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