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JIPMER 2014
Exam
JIPMER
Year
2014
Subject
Physics
Chapter
Magnetic Properties of Matter

JIPMER 2014 · Physics · Magnetic Properties of Matter

Magnetic field of the earth is H=0.3 ~g . A magnet is vibrating 5...

Magnetic field of the earth is H=0.3 gH=0.3 \mathrm{~g}. A magnet is vibrating 5 oscillations per min then the dippreciation required in the magnetic field of the earth of increase time period upto 10 oscillations per minute is

Options

  1. A2.252.25 g
  2. B0.60.6 g
  3. C0.90.9 g
  4. D0.120.12 g

Correct answer

A. 2.252.25 g

Step-by-step solution

We know that T∝1H∴T1T2=H2H1T \propto \frac{1}{\sqrt{H}} \therefore \quad \frac{T_1}{T_2}=\sqrt{\frac{H_2}{H_1}}, 510=H23⇒12=H23\frac{5}{10}=\sqrt{\frac{H_2}{3}} \Rightarrow \frac{1}{2}=\sqrt{\frac{H_2}{3}}14=H23&H2=0.75\begin{aligned}& & \frac{1}{4} & =\frac{H_2}{3} \& & H_2 & =0.75\end{aligned}$DippreciationinfieldDippreciation in field=3-0.75=2.25$
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