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NEET 2002
Exam
NEET
Year
2002
Subject
Physics
Chapter
Magnetic Properties of Matter

NEET 2002 · Physics · Magnetic Properties of Matter

Two bar magnets having geometry with magnetic moments M and 2 M are...

Two bar magnets having geometry with magnetic moments MM and 2M2 M are first placed in such a way that their similar poles are same side then its time period of oscillation is T1T_1. Now the polarity of one of the magnet is reversed then the time period of oscillation is T2T_2, so:

Options

  1. AT1<T2T_1 < T_2
  2. BT1=T2T_1=T_2
  3. CT1>T2T_1>T_2
  4. DT2=∞T_2=\infty

Correct answer

A. T1<T2T_1 < T_2

Step-by-step solution

We can write T=2π1MB⇒T∝1MT=2 \pi \sqrt{\frac{1}{M B}} \Rightarrow T \propto \frac{1}{\sqrt{M}} Case I : M1=2M+MM_1=2 M+M Case II : M2=2M−MM_2=2 M-M∴T1T2=M3M=13⇒T2=3T1\begin{aligned} & \therefore \frac{T_1}{T_2}=\sqrt{\frac{M}{3 M}}=\frac{1}{\sqrt{3}} \\ & \Rightarrow T_2=\sqrt{3} T_1 \end{aligned}$$
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