A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 sec in earth's horizontal magnetic field of 24 microtesla. Wh

Question

A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 sec in earth's horizontal magnetic field of 24 microtesla. When horizontal field 18 microtesla is produced opposite to the earth's field by placing a current carrying wire, the new time period of the magnet will be

TestHub · Accepted Answer

Time period of a vibration magnetometer, T ∝ 1 B ⇒ T 1 T 2 = B 2 B 1 ⇒ T 2 = T 1 B 1 B 2 = 2 24 × 10 - 6 6 × 10 - 6 = 4 s

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