| ASSERTION: Vibration magnetometer can be used to compare the magnetic moment of two bar magnets. |
| REASON: By using vibration magnetometer we can find the time period of vibration of the magnet. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: B
Solution :
Using vibration magnetometer we can find time period of vibration of magnet which is given by. \[\Rightarrow \,\,T=2\pi \sqrt{\frac{1}{M{{B}_{H}}}}\] Where M = magnetic dipole moment \[{{B}_{H}}=\]Horizontal component of earth's magnetic field. Using magnetometer we can find out time period of two magnets. Using above formula we can compare their magnetic moment by \[\frac{{{M}_{1}}}{{{M}_{2}}}=\frac{T_{2}^{2}}{T_{1}^{2}}\]
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