A magnetic compass needle oscillates 30 times per minute at a place where the dip is , and times per minute where the dip is . If and are respectively the total magnetic field due to the earth at the two places, then the ratio is best given by :
Compass needle 1
Compass needle 2
Option 1)
Option 2)
Option 3)
Option 4)
Study 40% syllabus and score up to 100% marks in JEE