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NCERT Solutions for class 12 Physics | Chapter 5 - Magnetism and Matter

Questions
1 At a given place on earth’s surface the horizontal component of earth’s magnetic field is 2 × 103-5 T and resultant magnetic field is 4 × 103-5 T. The angle of dip at this place is
A 30°
B 60°
C 90°
D 45°

Answer:60°
2 The vertical component of earth’s magnetic field . at a place is √3 times the horizontal component the value of angle of dip at this place is
A 30°
B 45°
C 60°
D 90°

Answer:60°
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3 A magnet of dipole moment M is aligned in equilibrium position in a magnetic field of intensity B. The work done to rotate it through an angle 0 with the magnetic field is
A MB sin θ
B MB cos θ
C MB (1 – cos θ)
D MB(l – sin θ)

Answer:MB (1 – cos θ)
4 At a point on the right bisector of a magnetic dipole, the magnetic
A potential varies as 1/r²
B potential is zero at all points on the right bisector.
C field varies as r3.
D field is perpendicular to the axis of dipole.

Answer:potential is zero at all points on the right bisector.
5 At a certain place on earth, BH=Class 12 Physics Chapter 5 Magnetism and Matter angle of dip at this place is
A 60°
B 30°
C 45°
D 90°

Answer:60°
6 A diamagnetic material in a magnetic field moves
A perpendicular to the field.
B from weaker to stronger parts.
C from stronger to weaker parts.
D in random direction.

Answer:from stronger to weaker parts.
7 In which type of material the magnetic susceptibility does not depend on temperature?
A Diamagnetic
B Paramagnetic
C Ferromagnetic
D Ferrite

Answer:Diamagnetic
8 Domain formation is the necessary feature of
A diamagnetism
B Paramagnetis.
C ferromagnetism.
D all of these.

Answer:ferromagnetism.
9 The best material for the ore of a transformer is
A stainless steel
B mild steel
C hard steel
D soft iron

Answer:soft iron
10 The magnetic susceptibility of an ideal diamagnetic substance is
A +1
B 0
C -1
D ∞

Answer:-1
11 A magnetic needle suspended parallel to a magnetic field requires /3 J of work to turn it through 60°. The torque needed to maintain the needle in this position will be
A 2√3 J
B 3 J
C √ J
D Class 12 Physics Chapter 5 Magnetism and Matter

Answer:3 J
12 If the magnetising field on a ferromagnetic material is increased, its permeability.
A is decreased
B is increased
C is unaffected
D may be increased or decreased.

Answer:is decreased
13 Lines of force, due to earth’s horizontal magnetic field, are
A elliptical
B curved lines
C concentric circles
D parallel and straight

Answer:parallel and straight
14 Angle of dip is 90° at
A poles.
B equator.
C both at equator and poles.
D tropic of cancer.

Answer:poles.
15 Curie law xT = constant, relating magnetic susceptibility (x) and absolute temperature (T) of magnetic substance is obeyed by
A all magnetic substances.
B paramagnetic substances.
C diamagnetic substances.
D ferromagnetic substances.

Answer:paramagnetic substances.
16 The material suitable for making electromagnets should have
A high retentivity and high coercivity.
B low retentivity and low coercivity.
C high retentivity and low coercivity.
D low retentivity and high coercivity.

Answer:high retentivity and low coercivity.
17 Curie temperature is the temperature above which
A a ferromagnetic material becomes paramagnetic.
B a ferromagnetic material becomes diamagnetic.
C a paramagnetic material becomes diamagnetic.
D a paramagnetic material becomes ferromagnetic.

Answer:a ferromagnetic material becomes paramagnetic.
18 Three needles N1 N2 and N3 are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet, when brought close to them, will
A attract N1 strongly, but repel N2 and N3 weakly.
B attract all three of them.
C attract N1 and N2 strongly but repel N3.
D attract N1 strongly, N2 weakly and repel N3 weakly.

Answer:attract N1 strongly, N2 weakly and repel N3 weakly.
19 A 25 cm long solenoid has radius 2 cm and 500 total number of turns. It carries a current of 15 A. If it is equivalent to a magnet of the same size and magnetisation Class 12 Physics Chapter 5 Magnetism and Matteris then is
A 3 π Am-1
B 30000 π Am-1
C 300 Am-1
D 30000 Am-1

Answer:30000 Am-1
20 A magnetic needle is kept in a non-uniform magnetic field. It experiences
A a torque but not a force.
B neither a force nor a torque.
C a force and a torque.
D a force but not a torque.

Answer:a force and a torque.

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