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Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - NEET MCQ


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10 Questions MCQ Test - Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14)

Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) for NEET 2024 is part of NEET preparation. The Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) questions and answers have been prepared according to the NEET exam syllabus.The Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) below.
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Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 1

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

Detailed Solution for Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - 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: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 2

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

Detailed Solution for Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 2

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.

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Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 3

Arrange the following in the increasing order of magnetic susceptibility.

Detailed Solution for Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 3

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: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 4

Pick out the temperature at which iron becomes paramagnetic?

Detailed Solution for Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 4

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: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 5

Soft iron is used in the cores of transformers.

Detailed Solution for Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 5

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: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 6

How many quantities are required to specify the magnetic field of the earth?

Detailed Solution for Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 6

Three quantities are needed to specify the magnetic field of the earth on its surface, namely, the horizontal component, the magnetic declination and the magnetic dip. These are known as elements of the earth’s magnetic field or magnetic elements.

Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 7

Which among the following is denoted by δ?

Detailed Solution for Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 7

Magnetic dip or inclination at a place is defined as the angle made by the Earth’s magnetic field with the horizontal in the magnetic meridian. It is denoted by δ.
Magnetic declination at a place is defined as the angle between the geographic meridian and magnetic meridian.

Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 8

The Earth always have both horizontal and vertical components everywhere.

Detailed Solution for Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 8

No, this statement is false. The Earth always has a vertical component except at the equator. Similarly, the earth always has a horizontal component except at the poles.

Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 9

At the magnetic North Pole of the Earth, what is the value of the angle of dip?

Detailed Solution for Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 9

Angle of dip is 90o at geographical North Pole because attraction on the North Pole of needle is very strong and the needle remains in vertical plane. At the magnetic equator, the needle will point horizontally, i.e. dip angle is 0o. As you move from the magnetic equator towards the magnetic pole, the angle increases in the northern hemisphere. So, the angle of dip is maximum.

Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 10

What is the relation between angle of dip and magnetic latitude?

Detailed Solution for Test: The Bar Magnet, Magnetism and Gauss’s Law (January 14) - Question 10

If a magnet is freely suspended or inclined or dipped, the angle between the horizontal and the angle of inclination of the magnet that is inclined only by the earth’s magnetic field will indicate the magnetic latitude. The relation is as follows:
tanδ=2tanλ

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