Compass needle gives 20 oscillations in 1 minute at a point A, it gives 60 oscillations in 150 seconds at a point B, at A & B net field due to earth are in ratio of 4 : 3, find ratio of cos δ at both points (δ = angle of dial)

Compass needle gives 20 oscillations in 1 minute at a point A, it give

1.	Compass needle gives 20 oscillations in 1 minute at a point A, it gives 60 oscillations in 150 seconds at a point B, at A & B net field due to earth are in ratio of 4 : 3, find ratio of cos δ at both points (δ = angle of dial)
Answer» Compass needle gives 20 oscillations in 1 minute at a point A, it gives 60 oscillations in 150 seconds at a point B, at A & B net field due to earth are in ratio of 4 : 3, find ratio of $c o s δ$ at both points $(δ$ = angle of dial)

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Compass needle gives 20 oscillations in 1 minute at a point A, it gives 60 oscillations in 150 seconds at a point B, at A &amp; B net field due to earth are in ratio of 4 : 3, find ratio of cos δ at both points (δ = angle of dial)

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Compass needle gives 20 oscillations in 1 minute at a point A, it gives 60 oscillations in 150 seconds at a point B, at A & B net field due to earth are in ratio of 4 : 3, find ratio of cos δ at both points (δ = angle of dial)