Magnetism Question 105
Question: Using a bar magnet P, a vibration magnetometer has time period 2seconds. When a bar Q (identical to P in mass and size) is placed on top of P, the time period is unchanged. Which of the following statements is true
[MP PMT 1995]
Options:
A) Q is of non-magnetic material
B) Q is a bar magnet identical to P, and its north pole placed on top of P’s north pole
C) Q is of unmagnetized ferromagnetic material
D) Nothing can be said about Q’s properties
Show Answer
Answer:
Correct Answer: B
Solution:
$ T=2\pi \sqrt{\frac{I}{MB _{H}}} $ . If Q is an identical bar magnet then time period of system will be $ {T}’=2\pi \sqrt{\frac{2I}{(2M)B _{H}}}=T $
BETA
