Which of the following demonstrated that earth has a magnetic fied:

Intensity of cosmic rays (Stream of charged particle coming from outer space) is more at the poles than at the equator

Earth is surrounded by an ionsphere (a shell of charged particles)

Earth is a planet rotating about the north south axis

Large quantity of iron ore is found in the earth

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Cause of Ferromagnetism:

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Important Questions on Matter and Magnetism

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 53

The magnetic susceptibility of a paramagnetic substance is

3 \times 10^{- 4} .

If placed in a magnetising filed of

4 \times 10^{4} A m

.The intensity of magnetisation will be:

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 54

The volume susceptibility of a magnetic material is 30 × 10^–4. Its; relative permeability will be :-

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 55

The magnetic moment of a magnet of mass

75 gm is 9 \times 10^{- 7} A m^{2}

. If the density of the material of magnet is

7.5 \times 10^{3} kg m^{- 3}

than intensity of magnetization will be:

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 56

The coercivity of a bar magnet is 100A/m. It is to be demagnetised by placing it inside a solenoid of length 100 cm and number of turns 50. The current flowing the solenoid will be :

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 57

The space inside a toroid is filled with tungsten of susceptibility

6.8 \times 10^{- 5}

. The percentage increase in the magnetic field will be,

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 58

The length of a magnet is large compared to its width and breadth. The time period of its oscillation in a vibration magnetometer is

2 s

.the magnet is cut along its length into three equal part and three parts are then placed on each other with their like poles together. The time period of this combination will be:

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-2>Q 1

The magnetic moment of a short magnet is

8 {Am}^{2}

. The magnetic induction at a point

20 cm

away from its mid point on

(i)

axial point

(ii)

equatorial point respectively, will be :-

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-2>Q 2

A magnetic needle lying parallel to a magnetic field requires $W$ unit(s) of work to turn it through $60 °$ . The torque needed to maintain the needle in this position will be,

Cause of Ferromagnetism:

Important Questions on Matter and Magnetism

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