AIPMT PRELIMS2010Physics-Magnetism
AIPMT PRELIMS 2010 Physics Magnetometers MCQ Question
Type: MCQ-numerical-Medium-Class 12
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 a horizontal field of 18 microtesla is produced opposite to the earth's field by placing a current carrying wire, the new time period of magnet will be
A
4 s
B
1 s
C
2 s
D
3 s
Correct Answer
Option A
Detailed Explanation
The time period of oscillation is inversely proportional to the square root of the magnetic field. When the net field is reduced, the time period increases.
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