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JEE 2020 Revision: Magnetism and Matter - 1 (09.11.2019)

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Question 1

Three identical bars A, B and C are made of different magnetic materials. When kept in a uniform magnetic field, the field lines around them look as follows :

Make the correspondence of these bars with their material being diamagnetic (D), ferromagnetic (F) and paramagnetic (P)

Question 2

With a standard rectangular bar magnet the time period of a vibration magnetometer is 4 s. The bar magnet is cut parallel to its length into four equal pieces. The time period of vibration magnetometer when one piece is used (in second)(bar magnet breadth is small) is

Question 3

When we draw the graph between susceptibility

and temperature for three substances P, Q, and R. Then determine which type of property in substance P, Q, and R has

Question 4

Two short bar magnets of length 1 cm each have magnetic moments 1.20 Am² and 1.00 Am² respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the South. They have a common magnetic equator and are separated by a distance of 20.0 cm. The value of the resultant horizontal magnetic induction at the mid - point O of the line joining their centres is close to
(Horizontal component of earth’s magnetic induction is 3.6 × 10^–5 Wb/m²)

Question 5

Hysteresis loops for two magnetic material A and B are given below:

These materials are used to make magnets for electric generators, transformer core and electromagnet core. The it is proper to use:

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Nov 9JEE & BITSAT