Daily Practice Problems undefined Magnetism and Matter

Question:1

Which of the following is responsible for the earth’s magnetic field?

(а) Convective currents in earth’s core

(b) Diversive current in earth’s core.

(d) Translational motion of earth.

Question 2:

Air is an example of:

Paramagnetic material
Diamagnetic material
Ferromagnetic material
Antiferromagnetic material

Question 3:

Which materials have negative value of magnetic susceptibility?

Diamagnetic
Paramagnetic
Ferromagnetic
None of these

Question 4:

Which of the following is correct about magnetic monopole?

Magnetic monopole exist
Magnetic monopole does not exist
Magnetic monopole have constant value of monopole momentum.
The monopole momentum increase due to increase at its distance from the field.

Question 5:

The net magnetic flux through any closed surface, kept in a magnetic field is

(a) zero

(b) μ₀4π

(d) None

Question 6:

Magnetic field arises due to charges in motion. Can a system have magnetic moments even though its net charge is zero?

Question 7:

In the magnetic meridian of a certain place, the horizontal component of the earth’s magnetic field is 0.26G and the dip angle is 60°. What is the magnetic field of the earth at this location?

Question 8:

Define magnetic dipole moment of a magnet and write its unit by taking into consideration the torque acting on it, when placed in magnetic field. Is it a vector or a scalar?

Question 9:

In what way is the behaviour of a diamagnetic material different from that of a paramagnetic, when kept in an external magnetic field?

Question 10:

A short bar magnet placed with its axis at 30° with an external field of 800 G experiences a torque of 0.016 Nm.

(a) What is the magnetic moment of the magnet?

(b) What is the work done in moving it from its most stable to most unstable position?

(c) The bar magnet is replaced by a solenoid of cross-sectional area 2 × 10^–4 m2 and 1000 turns, but of the same magnetic moment. Determine the current flowing through the solenoid.

Question 11:

The earth’s magnetic field at the equator is approximately 0.4 G. Estimate the earth’s dipole moment.

Question 12:

Define Magnetic declination & angle of dip?

Question 13:

Define magnetic susceptibility of a material. Name two elements, one having positive susceptibility and the other having negative susceptibility. What does negative susceptibility signify?

Question 14:

Write two characteristics of a material used for making permanent magnets?

Question 15:

A solenoid has a core of a material with relative permeability 400. The windings of the solenoid are insulated from the core and carry a current of 2A. If the number of turns is 1000 per metre, calculate (a) H, (b) M, (c) B.

Question 16:

Differentiate between the magnetic properties of soft iron and steel.

Question 17:

A magnetic needle of magnetic moment 6.7 × 10^–2A m² and moment of inertia 7.5 × 10^–6 kg m² is performing simple harmonic oscillations in a magnetic field of 0.01 T. Time taken for 10 complete oscillations is

Question 18:

A paramagnetic material has 10²⁸ atoms/m³. It’s magnetic susceptibility at temperature 350 K is 2.8 × 10^–4. Its susceptibility at 300 K is

Question 19:

The magnetic moment of short bar magnet is 1.6 m². It is placed in the magnetic meridian with north pole pointing south. The neutral point is obtained at 20 cm from the centre of the magnet. Calculate the horizontal component H of earth’s field. If magnet be reversed i.e., north pole pointing north, find the position of the neutral point.

Question 20:

Depict the behaviour of magnetic field lines near

(i) diamagnetic and

(ii) paramagnetic substances. Justify, giving reasons.

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All About Daily Practice Problems on Class 12 Physics Magnetism and Matter NCERT Chapter 5

Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 12 Physics Magnetism and Matter NCERT Chapter 5 useful.

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