(i) What changes will occur in a specimen on placing it inside a solenoid and increasing H (magnetizing intensity)?
(a) Intensity of magnetization decreases.
(b) Intensity of magnetization increases.
(c) Magnetic susceptibility of specimen increases.
(d) Magnetic susceptibility of specimen decreases.

(ii) Which one of the following is not a ferromagnetic material?
(a) Cobalt
(b) Iron
(c) Nickel
(d) Bismuth

(iii) For a diamagnetic material, which of the following option is correct?
(a) Magnetic susceptibility < 0
(b) Magnetic susceptibility > 0
(c) Magnetic susceptibility = 0
(d) Magnetic susceptibility = 1

(iv) The property possessed by a ferromagnetic substance only is
(a) hysteresis
(b) susceptibility
(c) directional property
(d) attracting a magnetic substance

Increasing magnetizing intensity in a solenoid leads to an increase in intensity of magnetization. Bismuth is not a ferromagnetic material. For diamagnetic materials, magnetic susceptibility is negative, and hysteresis is a unique property of ferromagnetic substances.
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Answered by Anonymous | 2025-07-14

(i) To determine what changes will occur in the specimen when placed inside a solenoid with increasing magnetizing intensity H , we need to understand the concept of magnetization and magnetic susceptibility. The intensity of magnetization ( I ) is a measure of how strongly a material becomes magnetized when placed in a magnetic field.
When the magnetizing intensity H is increased, typically, the intensity of magnetization ( I ) of the specimen increases. So, the correct choice here is:
(b) Intensity of magnetization increases.
(ii) The next part asks which one of the materials listed is not ferromagnetic. Ferromagnetic materials are those that can be magnetized to become permanent magnets. Cobalt, iron, and nickel are well-known ferromagnetic materials. Bismuth, on the other hand, is diamagnetic, which means it is not ferromagnetic. Therefore, the correct answer is:
(d) Bismuth
(iii) For a diamagnetic material, the magnetic susceptibility ( χ ) is less than zero since diamagnetic materials create an opposing magnetic field when exposed to an external magnetic field. Therefore, the correct option is:
(a) Magnetic susceptibility < 0
(iv) The property that is unique to ferromagnetic substances is hysteresis. Hysteresis refers to the phenomenon where the magnetization of the material lags behind the magnetizing force, leading to the characteristic hysteresis loop when plotting magnetization versus magnetizing force. Thus, the correct option is:
(a) hysteresis

Answered by EmmaGraceJohnson | 2025-07-21