Download App

Magnetism And Matter — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsMagnetism And Matter1 Mark
Question
A paramagnetic sample shows a net magnetisation of $8Am^{-1}$ when placed in an external magnetic field of $0.6T$ at a temperature of $4K.$ When the same sample is placed in an external magnetic field of $0.2T$ at a temperature of $16K,$ the magnetisation will be
✓

Answer

From the Curie’s law explains, $\text{I}\propto\frac{\text{B}}{\text{T}}$
Here,$ B$ is magnetic field induction, $I$ is the intensity of magnetisation and $T$ is absolute temperature.
$\Rightarrow\ \Big(\frac{\text{I}_2}{\text{I}_1}\Big)=\Big(\frac{\text{B}_2}{\text{B}_1}\Big)\times\Big(\frac{\text{T}_1}{\text{T}_2}\Big)$
Given,
$I_1 = 8 Am^{-1}, B_1 = 0.6T, T_1 = 4 K, B_2 = 0.2T, T_2 = 16 K, I_2 =$ ?
By putting values in equation$ …(i),$ we have,
$\text{I}_2=\Big(\frac{2}{3}\Big)\text{Am}^{-1}.$

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

Explore more

More "M.C.Q (1 Marks)" from Magnetism And Matter→Magnetism And Matter — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

A radio transmitter operates at a frequency of $880\ kHz$ and a power of $10\ kW.$ The number of photons emitted per second are
→
A frog can be levitated in a magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible, because the body of the frog behaves as
→
In the circuit as shown in the figure the effective capacitance between $A$ and $B$ is
→
Consider the following statements:
  1. An emf can be induced by moving a conductor in a magnetic field.
  2. An emf can be induced by changing the magnetic field.
  1. Both A and B are true.
  2. A is true but B is false.
  3. B is true but A is false.
  4. Both A and B are false.
→
The amplification produced by a triode is due to the action of(a) Filament(b) Cathode(c) Grid   (d) Plate
       
→
Which of the following is not true for wire wound resistor?
→
In the figure, shown the magnetic induction at the centre of there arc due to the current in portion $AB$ will be
→
A device which converts electrical energy into mechanical energy is(a) Dynamo(b) generator(c) Electric motor(d) Induction coil
       
→
The capacity of a parallel plate condenser is 10μF  without dielectric. Dielectric of constant 2 is used to fill half the distance between the plates, the new capacitance in μF is(a) 10(b) 20(c) 15       (d) 13.33
       
→
A parallel plate capacitor with air as medium between the plates has a capacitance of $10\ \mu F.$ The area of capacitor is divided into two equal halves and filled with two media as shown in the figure having dielectric constant $k_1=2$ and  $k_2=4$. The capacitance of the system will now be
→