Download App

Magnetic Properties of Matter — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMagnetic Properties of Matter1 Mark
Question
A perpendicular material is place in a magnetic fields. Consider the following statemetns:
  1. If the magnetic field is increased, the magnetization is increased.
  2. If the temperature is increased, the magnetization is increased.
  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.
✓

Answer

  1. A is true but B is false.

Explanation:

A paramagnetic material is placed in a magnetic field.

Þ If the magnetic field is increased, the magnetization is increased.

$\therefore\text{Magnetiazation}\overrightarrow{\text{I}}=\frac{\text{Magnetic Moment}}{\text{volume}}=\frac{\overrightarrow{\text{M}}}{\text{V}}$

Þ If the temperature is increaed, the magnetization is decreased.

Because susceptibility of a paramagnetic substance is inversely proportional to the absolute temperarue.

$\text{X}=\frac{\text{C}}{\text{T}}$

after curie temperature susceptibility varies with temperature as $\text{X}=\frac{\text{C}^1}{\text{T}-\text{T}_\text{C}}$

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 Magnetic Properties of Matter→Magnetic Properties of Matter — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Let iE, iC and iB represent the emitter current, the collector current and the base current respectively in a transistor. Then,
  1. iC is slightly smaller than iE.
  2. iC is slightly greater than iE.
  3. iB is much smaller than iE.
  4. iB is much greater than iE.
→
Two identical bar magnets are fixed with their centres at a distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the figure. The force on the charge Q is:

→

To make the field radial in a moving coil galvanometer

(a) The number of turns in the coil is increased

(b) Magnet is taken in the form of horse-shoe

(c) Poles are cylindrically cut

(d) Coil is wounded on aluminium frame
→

The radii of two metallic spheres P and Q  are  and  respectively. They are given the same charge. If  . then on connecting them with a thin wire, the charge will flow

(a) From P to Q

(b) From Q to P

(c) Neither the charge will flow from  P to Q nor from Q to P

(d) The information is incomplete
→

The electric intensity due to an infinite cylinder of radius R and  having charge q per unit length at a distance r(r > R) from its axis is

(a) Directly proportional to  

(b) Directly proportional to  

(c) Inversely proportional to r

(d) Inversely proportional to  
→

A rectangular coil 20 cm × 20 cm  has 100 turns and carries a current of 1 A. It is placed in a uniform magnetic field       B  = 0.5 T with the direction of magnetic field parallel to the plane of the coil. The magnitude of the torque required to hold this coil in this position is

(a) Zero  

(b) 200 N-m

(c) 2 N-m  

(d) 10 N-m
→
In a hydrogen atom, which of the following electronic transitions would involve the maximum energy change:
→

1 Curie is equal to

(a) 3  disintegrations/sec

(b) 3.7   disintegrations/sec

(c) 5 disintegrations/sec

(d) 3.7  disintegrations/sec
→
When a coil is moved or rotated relative a fixed magnet then.
→
In an insulator, the forbidden energy gap between valence band and conduction band is of the following order :
→