MCQ
If a brass bar is placed on a vibrating magnet, then its time period
  • A
    Decreases
  • Increases
  • C
    Remains unchanged
  • D
    First increases then decreases

Answer

Correct option: B.
Increases
Increases

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

The work function of a metal is $4.2 \mathrm{eV}$, its threshold wavelength will be
Learned Indian classical vocalists do not like the accompaniment of a harmonium because
Which pair of the following forces will never give resultant force of $2 N$
A cricket ball is thrown up with a speed of $19.6 ms$. The maximum height it can reach is
In an isochoric process if $T_1=27^{\circ} \mathrm{C}$ and $T_2=127^{\circ} \mathrm{C}$, then $P_1 / P_2$ will be equal to
$A B$ is a potentiometer wire of length $100 \mathrm{~cm}$ and its resistance is $10$ ohms. It is connected in series with a resistance $R=40 \mathrm{ohms}$ and a battery of e.m.f. $2 V$ and negligible internal resistance. If a source of unknown e.m.f. $E$ is balanced by $40 \mathrm{~cm}$ length of the potentiometer wire, the value of $E$ is
Image
Energy of electron in a orbit of $H-$atom is
A long circular tube of length $10 \ m$ and radius $0.3 \ m$ carries a current $I$ along its curved surface as shown. A wire-loop of resistance $0.005$ ohm and of radius $0.1 \ m$ is placed inside the tube with its axis coinciding with the axis of the tube. The current varies as $I=I_0 \cos (300 t)$ where $I_0$ is constant. If the magnetic moment of the loop is $N \mu_0 I_0 \sin (300 t)$, then ' $N$ ' is
Every atom makes one free electron in copper. If 1.1 ampere current is flowing in the wire of copper having 1 $\mathrm{mm}$ diameter, then the drift velocity (approx.) will be (Density of copper $=9 \times 10^3 \mathrm{~kg} \mathrm{~m}^{-3}$ and atomic weight $(=63)$
When objects at different distances are seen by the eye, which of the following remains constant