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A short magnet oscillation in vibration magnetometer with a frequency 10Hz. A downward current of 15A is established in a long vertical wire placed 20cm to the West of the magnet. The new frequency of the short magnet is (the horizontal of the component os earth's magnetic field is 12mu )

A short magnet oscillates in a vibration magnetometer with a time period of 0.10 s where the horizontal component of earth's magnetic field is 24 mu T . An upward current of 18 A is established in the vertical wire placed 20 cm east of the magnet . Find the new time period.

Assertion :- The rate of appearance of new forms is liked to the life cycle or the life span of organisms. Reason :- The organism with short life span have ability to produce more progenies in shorter time and that have chance to more expsure with nature.

A short magnet makes 40 oscillations per minute when used in an oscillation magnetometer at a place where the earth's horizontal magnetic field is 25 muT . Another short magnet of magnetic moment 1.6 A m^2 is placed 20 cm east of the oscillating magnet. Find the new fregquency of oscillation if the magnet has its north pole (a) towards north and (b) towards south.

The diagrams shows vertical sections of kidneys of coypu, brown rat and kangaroo rat, showing the relative size and are never short of water to drink. Brown rats are able to go some days without drinking. Kangaroo rats are able to live in deserts without drinking at all. Which kidney belongs to which animal.?