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# Test: Permanent Magnets & Electromagnets

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## 10 Questions MCQ Test Physics Class 12 | Test: Permanent Magnets & Electromagnets

Test: Permanent Magnets & Electromagnets for NEET 2023 is part of Physics Class 12 preparation. The Test: Permanent Magnets & Electromagnets questions and answers have been prepared according to the NEET exam syllabus.The Test: Permanent Magnets & Electromagnets MCQs are made for NEET 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Permanent Magnets & Electromagnets below.
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Test: Permanent Magnets & Electromagnets - Question 1

### Which one of the following is feebly repelled by a magnet?

Detailed Solution for Test: Permanent Magnets & Electromagnets - Question 1

Diamagnetic materials are those which when placed in a magnetizing field are feebly magnetized in a direction opposite to that of the magnetizing field. Therefore, it is feebly repelled by a magnet. Example: zinc, gold, etc.

Test: Permanent Magnets & Electromagnets - Question 2

### Which one of the following, when suspended freely, slowly sets itself parallel to the direction of the magnetic field?

Detailed Solution for Test: Permanent Magnets & Electromagnets - Question 2

Paramagnetic materials are those when suspended freely inside the magnetic field, it slowly sets itself parallel to the direction of the magnetic field. When placed in a non-uniform magnetic field, it tends to move from weaker to a stronger magnetic field.

Test: Permanent Magnets & Electromagnets - Question 3

### Which among the following has a relative permeability much larger than 1?

Detailed Solution for Test: Permanent Magnets & Electromagnets - Question 3

The relative permeability of ferromagnetic materials is much larger than 1. Ferromagnetic substances are those, which when placed in a magnetic field are strongly magnetized in the direction of the magnetizing field, i.e., it is strongly attracted by a magnet.

Test: Permanent Magnets & Electromagnets - Question 4

Aluminum is a diamagnetic material.

Detailed Solution for Test: Permanent Magnets & Electromagnets - Question 4

No, aluminum is a paramagnetic material. Paramagnetic materials are those, which when placed in a magnetic field are feebly magnetized in the direction of the magnetizing field, i.e. it is feebly attracted by a magnet.

Test: Permanent Magnets & Electromagnets - Question 5

Arrange the following in the increasing order of magnetic susceptibility.

Detailed Solution for Test: Permanent Magnets & Electromagnets - Question 5

Diamagnetic materials have a small and negative value of magnetic susceptibility. Paramagnetic materials have a small and positive value of magnetic susceptibility and ferromagnetic materials have a large and positive value of magnetic susceptibility.

Test: Permanent Magnets & Electromagnets - Question 6

Identify the expression for Curie’s constant from the following.

Detailed Solution for Test: Permanent Magnets & Electromagnets - Question 6

Curie’s law in magnetism states that the magnetic susceptibility of paramagnetic materials is inversely proportional to its absolute temperature and it is given by: χm = C/T

Test: Permanent Magnets & Electromagnets - Question 7

Pick out the temperature at which iron becomes paramagnetic?

Detailed Solution for Test: Permanent Magnets & Electromagnets - Question 7

Iron is a ferromagnetic material. Ferromagnetism decreases with a rise in temperature, and above a certain temperature called “Curie’s temperature,” ferromagnets become paramagnets. For iron, it is approximately, 800 °C.

Test: Permanent Magnets & Electromagnets - Question 8

Soft iron is used in the cores of transformers.

Detailed Solution for Test: Permanent Magnets & Electromagnets - Question 8

Soft iron has high permeability and low retentivity and is used as an electromagnet. The area under the hysteresis loop for soft iron is less. So where the repeated cycles of magnetization occur, there on using soft iron core, energy losses are less. That is why soft iron is used in cores of transformers, galvanometers, generators, etc.

Test: Permanent Magnets & Electromagnets - Question 9

Pick out the material that cannot be used to make permanent magnets.

Detailed Solution for Test: Permanent Magnets & Electromagnets - Question 9

Permanent magnets are made up of materials having high retentivity, high coercivity, and high permeability such as steel. Other suitable materials for making permanent magnets are alnico (an alloy of iron, aluminum, nickel, copper, and cobalt), cobalt steel, and ticonal. That leaves zinc as the one that cannot be used to make permanent magnets.

Test: Permanent Magnets & Electromagnets - Question 10

Find the true statement.

Detailed Solution for Test: Permanent Magnets & Electromagnets - Question 10

The magnetic susceptibility of diamagnetic materials doesn’t depend upon temperature. This is often because there’s an outsized barrier between the bottom state and therefore the excited states of diamagnetic substances. Hence, it remains constant during the change of temperature. All the other statements are false.

## Physics Class 12

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## Physics Class 12

157 videos|452 docs|213 tests

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