Using a bar magnet $ P,$ a vibration magnetometer has time period $2$ $seconds$. 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
Using a bar magnet $ P,$ a vibration magnetometer has time period $2$ $seconds$. 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
- 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
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